Two unbiased coins are tossed simultaneously. Find the probability of getting two head                             (ii)   one head one tail                               (iv)   at least one head at most one head                 (vi)   no head

Explanation

If two unbiased coins are tossed simultaneously, then the total outcomes may be HH, HT, TH, T T.

No. of total outcomes =4

(i) two heads

favourable outcome for two heads are {HH}.

No. of favourable outcomes =1

P( two heads )`=frac{1}{4}`

(ii) favourable outcome for one tail are TH,HT.

No. of favourable outcomes =2

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