Three coins are tossed once. Find the probability of getting atm

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 Multiple Choice QuestionsShort Answer Type

431. A letter is chosen at random, from the word ‘ASSASSINATION’. Find the probability that letter is (i) a vowel (ii) a consonant
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434. A coin is tossed twice. What is the probability that One head and one tail occurs?
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435. A coin is tossed twice. What is the probability that no head occurs?

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436. Three coins are tossed once. Find the probability of getting 3 heads.
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437. Three coins are tossed once. Find the probability of getting 2 heads.
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438. Three coins are tossed once. Find the probability of getting atleast 2 heads.
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439. Three coins are tossed once. Find the probability of getting atmost 2 heads.


Three coins are tossed.
rightwards double arrow Sample space, S = {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}
rightwards double arrow         n(S) = 8
EventA: At most 2 heads are obtained.
rightwards double arrow         A = {HHT, HTH, THH, TTH, THT, HTT, TTT} rightwards double arrow   n(A) = 7

Hence,   straight P left parenthesis straight A right parenthesis space equals fraction numerator space straight n left parenthesis straight A right parenthesis over denominator straight n left parenthesis straight S right parenthesis end fraction equals 7 over 8

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440. Three coins are tossed once. Find the probability of getting no head.
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