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Exam Questions Papers - Engineering

Q1:

A fair coil is tossed 10 times. What is the probability that ONLY the first two tosses will yield heads?

A

B

C

D

ANS:C -

Use ncr, (p)r (q)n-r [for any two losses yield head]. But in present case it is required case it is only for first two tosses. Thus in this case 10 times.