the no. of evan divisors of 1600 are:

(a)18 (b)21 (c)3 (d)none

ans: a

Dear shefali

1600=2⁷5²

so number of all divisors =(7+1)(2+1) =21

 but these diviser also include    1,5⁰,5² ie  1,5,25

  which is not even 

so even divisior =21-3 =18

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