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# If the probability of seeing an exponent question on a particular stan

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If the probability of seeing an exponent question on a particular stan [#permalink]
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Bunuel
If the probability of seeing an exponent question on a particular standardized test is 5% for each question, what is the probability of seeing an exponent question in the first two questions?

A. 0.5
B. 0.0975
C. 0.0475
D. 0.025
E. 0.0125

We could have exponent + exponent, not exp + exponent, or exponent + not exp, any of these satisfy "seeing an exponent question in the first two questions." Thus the easier way is to calculate not exp + not exp and subtract that from 100%.

0.95*0.95 = roughly 90%. $$1 - 90\% = 10\%.$$

Ans: B
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Re: If the probability of seeing an exponent question on a particular stan [#permalink]
Can anyone tell, since we know probability of exponent question is 1/20 and since it is an independent event , so why not its 0.0025 i.e ($$\frac{1}{20}*\frac{1}{20}$$)?
Re: If the probability of seeing an exponent question on a particular stan [#permalink]
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