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