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UPSC Civil Service Exam Questions - Engineering

Q1:

Probability of a lO-year flood to occur at least once in the next 4 years is

A 25%

B 35%

C 50%

D 65%

ANS:B - 35%

1/T=P 1/10=0.1
1-P=q 1-0.1=0.9
q^n - never occurring.
1-q^n Occurring once.

Hence. 1-0.9^4=34.5% = Ans.