1. By what least number 25 x 20 x 9 x 12 x 30 should be multiplied to make it a perfect square number ?
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By: anil on 05 May 2019 02.25 am
Expression : 25 x 20 x 9 x 12 x 30 = $$(5^2) imes(2^2 imes5) imes(3^2) imes(2^2 imes3) imes(2 imes3 imes5)$$ = $$(2^5) imes(3^4) imes(5^4)$$ To make above number a perfect square, all the exponents must be even, thus the smallest number which should be multiplied = $$2$$ => Ans - (D)
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