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Sunday, March 11, 2007
"ALGEBRA QUESTION OF THE DAY"
If n is an odd integer, which one of the following is an even integer? (A) n^3 (B) n/4 (C) 2n + 3 (D) n(n + 3) (E) ROOT n
We are told that n is an odd integer. So choose an odd integer for n, say, 1 and substitute it into each answer-choice. Now, n3 becomes 13 = 1, which is not an even integer. So eliminate (A). Next, n/4 = 1/4
is not an even integer—eliminate (B). Next, 2n + 3 = 2.1+ 3 = 5 is not an even integer—eliminate (C). Next, n(n + 3) = 1(1 + 3) = 4 is even and hence the answer is possibly (D). Finally, n = 1 , which is not even—eliminate (E). The answer is (D).
d
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ReplyDeleteWe are told that n is an odd integer. So choose an odd integer for n, say, 1 and substitute it into each
ReplyDeleteanswer-choice. Now, n3 becomes 13 = 1, which is not an even integer. So eliminate (A). Next,
n/4 = 1/4
is
not an even integer—eliminate (B). Next, 2n + 3 = 2.1+ 3 = 5 is not an even integer—eliminate (C).
Next, n(n + 3) = 1(1 + 3) = 4 is even and hence the answer is possibly (D). Finally, n = 1 , which is
not even—eliminate (E). The answer is (D).
THE ANSWER IS OBVIOUSLY D.
ReplyDeleteWE CAN SELECT FROM THE CHOISE AND SUBSTITUTE ANY ODD INTEGER..
THE ONLY CHOISE ILL B LEFT IS D.