Use some thinking to answer the following question. In the expression 51840/x^4, for which of the following values of x will the expression NOT be an integer?\nOptions:\n(A) 1/2\n(B) 1\n(C) 2\n(D) 3\n(E) 5
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We can straightaway eliminate A & B, since the expression will always yields an integer for those values\nOut of C, D, and E. Let us consider option E. 51840 has only one trailing zero and tens digit is not 5, so It has just one 5 in it. But for the expression to be an integer numerator should have 5^4. So the final answer is (E).
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