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Q.

The number of divisors of the form  4n+1,nN of the number  101011111313 contains the digit(s):

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a

2

b

9

c

3

d

4

answer is A, B, C.

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Detailed Solution

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Any factor of  101011111313=21051011111313  will be of the form  2a5b11c13d where  a=0,1,2,...10;b=0,1,2,...10;c=0,1,2,...11;d=0,1,2,...13; 
Factors should be of the type 4n+1a=0;c=0,2,4,6,8,10;   and  b,d can be any possible value.
Number of such divisors  =161114=924
Number of divisors of the form  4n+1,nN will be 923

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