Question

6. The probability of obtaining exactly “r' heads and (n-r) tails, when we toss n unbiased coins is​

Answer 1

Answer:

2nCrn.

Step-by-step explanation:

When we toss n unbiased coins; selection of exactly r heads from n coins =C  cr/n

; (remaining coins will obtain (n−r) tails)

Total number of ways which we could get by arranging n number of coins is =2 n  

 Probability of obtaining exactly r heads and (n−r) tails is = cr/n/2n

 

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