Grade 12Algebra
the no. of evan divisors of 1600 are:
(a)18 (b)21 (c)3 (d)none
ans: a
the no. of evan divisors of 1600 are:
(a)18 (b)21 (c)3 (d)none
ans: a
2 Answers
Badiuddin askIITians.ismu Expert
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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Badiuddin
Anjana Priya
I think the process mentioned above is correct, but the calculation is not clear That is,
1600=2^6 × 5^2 (not 2 raised by 7)
Number of divisors=(6+1)(2+1)=21
And finally minus 3 as explained above.
So, the final answer is 21-3=18
Thanks for considering my view.
Regards.
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