Wednesday, April 25, 2007

ALGEBRA QUESTION OF THE DAY

An odd number added to itself an odd number of times yields
(A) an odd number
(B) an even number
(C) a prime number
(D) a positive number
(E) a perfect square
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3 comments:

Anonymous said...

a

April 25, 2007 at 12:48 PM
Unknown said...

A

April 25, 2007 at 1:00 PM
Admin said...

Since pq/2 is prime, it is an integer. Hence, either p or q must be even; otherwise, the 2 would not
cancel and pq/2 would be a fraction. The only even prime number is 2. Hence, either p or q, but not both,
must be 2. The other one is an odd prime number. Now, the sum of an even number and an odd number is
an odd number. The answer is (A).

May 3, 2007 at 12:15 PM

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