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26-12-2017
Mathematics

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A fair coin is tossed 4 times. what is the probability that at least 2 heads appear

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26-12-2017

HHHH TTTT HHHT HHTH HTHH THHH TTTH TTHT THTT HTTT
HHTT HTHT HTTH TTHH THTH THHT

- is the sample space.

Total possible arrangements = 16.
Number with at least 2 heads = 11

Required probability = 11/16

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