A dice is thrown 5 times If 39 getting an even number rsquo is a lsquo success rsquo then the probab...........

Quantitative Aptitude (CDS) Probability

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A dice is thrown 5 times. If 'getting an even number’ is a ‘success’, then the probability of 4 successes is?

5/32

1/32

1/2

7/32

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Explanation:

Let E be the event of getting an even number.
Here n(T)=6
n(E)=3
Therefore, the probability of getting an even number=3/6=1/2
Hence, the probability of not getting an even number=1 – ½=1/2
Required probability of four success –
5C4 (1/2)^4 ×1/2
=5/32