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28 Apr 2022, 04:15
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D
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How many positive integers that are multiples of 3 are also divisors of 42 ?
A. One
B. Two
C. Three
D. Four
E. Five
A. One
B. Two
C. Three
D. Four
E. Five
28 Apr 2022, 04:20
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IMO D
I solved the problem by doing the prime factorization of 42 - 2,3,7 and used all combinations of products with the integer 3. Therefore, I came to 4 multiples of 3 that can divide 42 evenly. (3,2*3,3*7,2*3*7)
I solved the problem by doing the prime factorization of 42 - 2,3,7 and used all combinations of products with the integer 3. Therefore, I came to 4 multiples of 3 that can divide 42 evenly. (3,2*3,3*7,2*3*7)
03 May 2022, 00:42
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Please correct me if I am wrong:
divisors of 42 are 1,2,3,6,7,14,21,42 total 8 Divisors
out of these 8 Divisors
3,6,21& 42 are multiples of 3
hence 4 numbers Option D
divisors of 42 are 1,2,3,6,7,14,21,42 total 8 Divisors
out of these 8 Divisors
3,6,21& 42 are multiples of 3
hence 4 numbers Option D
