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Q.

 A natural number has prime factorization given by n=2x3y5z, where y and z are such that 

y+z=5 and y-1+z-1=56,y>z. Then the number of odd divisors of n, including 1, is 

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a

11

b

7

c

12

d

6

answer is C.

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Detailed Solution

y+z=5,1y+1z=56,y>zN=2x3y52 Solving y=3,z=2

 No.of odd divisors of N=(3+1)(2+1)=12

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