Find the probability of at most two tails or at least two heads in a toss of three coins.

Explanation

All possibilities:`{H,H,H},{H,T,H},{T,H,H},{H,H,T},{T,T,H},{H,T,T},{T,H,T},{T,T,T}`

Total number of outcomes=8
Number of outcomes with at most two tails or atleast two heads=7

Probability of at most two tails or at least two heads in a toss of three coins`=7/8`
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