12. The least possible value of A for which 90 x A is a perfect cube is (a) 200 (b) 300 (c) 500 (d) 600
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If 90*A is a perfect cube, every factor of it must be a cube of a prime number or of a multiple of a prime number. = 3*25*4 = 3* 100 = 300.
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(a) 200 (b) 300 (c) 500 (d) 600. c answer
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