Electronics and Communication Engineering - Exam Questions Papers - Discussion

2. 

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

[A].
[B].
[C].
[D].

Answer: Option C

Explanation:

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.


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