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OpenStudy (mayankdevnani):
From the divisors of 1980,how many of them are divisible by 4 but not by 15. (Question from PERMUTATION AND COMBINATION)
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OpenStudy (zarkon):
find the prime factorization...then the problem is pretty easy
OpenStudy (mayankdevnani):
prime factorization of 1980=\(\large \bf 2^2 \times 3^2 \times 5 \times 11\) |dw:1415759694789:dw|
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