What is the smallest positive integer which multiplied by 40 gives a perfect square? (A) 2 (B) 5 (C) 20 (D) 40 (E) None of these
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Originally Posted by sri340 What is the smallest positive integer which multiplied by 40 gives a perfect square? (A) 2 (B) 5 (C) 20 (D) 40 (E) None of these 10, but in the given choices it is missing. So the choice is.......?
Originally Posted by sri340 What is the smallest positive integer which multiplied by 40 gives a perfect square? (A) 2 (B) 5 (C) 20 (D) 40 (E) None of these $\displaystyle 40=2^3\cdot 5\Longrightarrow$ you have to make both 2 and 5 to have even powers, so... Tonio
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