---
title: A fair coin has a half chance of heads on every throw, even after 5… — Olympiad: logic traps and if-then ★★★ · tree and pragmatics
description: A fair coin has a half chance of heads on every throw, even after 5 heads in a row; it has no memory. Who acts: fair coin, coin, heads. A sentence of the lesson «Olympiad: logic traps and if-then ★★★» of the world course of Mova's primary school with its dependency tree and the pragmatics of every c
---

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# Olympiad: logic traps and if-then ★★★, sentence 17

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A fair coin has a half chance of heads on every throw, even after 5 heads in a row; it has no memory.

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**Who acts:** fair coin, coin, heads · **What happens:** have, chance · **To what, where:** half chance, memory

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This is a sentence of the lesson «Olympiad: logic traps and if-then ★★★» of the world course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (fair coin, coin, heads), what happens, when and where, as Mova's frames read it from the tree.

## The tree {#tree}

```conllu
# sent_id = school:world:193-olympiad-logic-traps-and-if-then.lesson:17
# text = A fair coin has a half chance of heads on every throw, even after 5 heads in a row; it has no memory.
# source = school lesson (ours)
# course = world
# lesson = 193-olympiad-logic-traps-and-if-then.lesson
# annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×1
1	A	a	DET	DT	Definite=Ind|PronType=Art	3	det	_	_
2	fair	fair	ADJ	JJ	Degree=Pos	3	amod	_	_
3	coin	coin	NOUN	NN	Number=Sing	4	nsubj	_	_
4	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	0	root	_	_
5	a	a	DET	DT	Definite=Ind|PronType=Art	7	det	_	_
6	half	half	ADJ	JJ	Degree=Pos|NumForm=Word|NumType=Frac	7	amod	_	_
7	chance	chance	NOUN	NN	Number=Sing	4	obj	_	_
8	of	of	ADP	IN	_	9	case	_	_
9	heads	head	NOUN	NNS	Number=Plur	7	nmod	_	_
10	on	on	ADP	IN	_	12	case	_	_
11	every	every	DET	DT	PronType=Tot	12	det	_	_
12	throw	throw	NOUN	NN	Number=Sing	9	nmod	_	_
13	,	,	PUNCT	,	_	17	punct	_	_
14	even	even	ADV	RB	_	17	advmod	_	_
15	after	after	ADP	IN	_	17	case	_	_
16	5	5	NUM	CD	NumForm=Digit|NumType=Card	17	nummod	_	_
17	heads	head	NOUN	NNS	Number=Plur	9	conj	_	_
18	in	in	ADP	IN	_	20	case	_	_
19	a	a	DET	DT	Definite=Ind|PronType=Art	20	det	_	_
20	row	row	NOUN	NN	Number=Sing	17	nmod	_	_
21	;	;	PUNCT	:	_	23	punct	_	_
22	it	it	PRON	PRP	Case=Nom|Gender=Neut|Number=Sing|Person=3|PronType=Prs	23	nsubj	_	_
23	has	have	VERB	VBZ	Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin	4	parataxis	_	Agree=R7-rel-agree|Haiku=4:conj
24	no	no	DET	DT	PronType=Neg	25	det	_	_
25	memory	memory	NOUN	NN	Number=Sing	23	obj	_	_
26	.	.	PUNCT	.	_	4	punct	_	_
```

## Pragmatics {#pragmatics}

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No stored speech act for this sentence.

<!-- .fr -->
| # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | **have** | present | a fair coin | a half chance of heads on every throw and 5 heads in a row |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent chance=Patient |
| 2 | **have** | present | coin | no memory |  |  |  |  | vn birth-28.2-1 «NP V NP»: agent=Agent memory=Patient |
| 3 | **chance** |  | heads on every throw and 5 heads in a row |  |  |  |  |  | nom chance «state intransitive»: of=agent |

<!-- .note -->
One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree.

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**Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:world:193-olympiad-logic-traps-and-if-then.lesson:17`.

**The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence.

See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/).

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- ← previous: [Olympiad: logic traps and if-then ★★★, 16](https://md.mova.elamur.ai/free/en/corpora/school/world/193-olympiad-logic-traps-and-if-then/16/)
- next →: [Olympiad: logic traps and if-then ★★★, 18](https://md.mova.elamur.ai/free/en/corpora/school/world/193-olympiad-logic-traps-and-if-then/18/)
- ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/world/193-olympiad-logic-traps-and-if-then/)