437.Three coins are tossed once. Find the probability of getting 2 heads.
Three coins are tossed.  Sample space, S = {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}      n(S) = 8 Event A: 2 heads are obtained           A = {HHT, HTH, THH}  n(A) = 3
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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.
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440.Three coins are tossed once. Find the probability of getting no head.