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Q.

A book containing 100 pages is opened at random. The probability that on that page a doublet is found is

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Start JEE / NEET / Foundation preparation at rupees 99/day !!

21% of IItians & 23% of AIIMS delhi doctors are from Sri Chaitanya institute !!
An Intiative by Sri Chaitanya

a

110

b

9101

c

9100

d

111

answer is C.

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Detailed Solution

A={11,22,33,44,55,66,77,88,99} 

n(A)=9c 1=9

n(S)=100c 1=100

P(A)=9100

 

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