If k and t are integers

walkingbanana: Junior | Next Rank: 30 Posts; Posts: 14; Joined: Tue Jan 27, 2009 8:35 pm; Location: Los Angeles, CA; Thanked: 1 times; GMAT Score:760

by walkingbanana » Mon Jul 06, 2009 2:00 pm

you can rephrase the question stem. if k^2-t^2 is odd, then one variable is even and one variable is odd.

i. if one variable is even and one variable is odd, k+t is odd + 2 is odd again
ii. k+t must be odd so squared, will still be odd
iii. one variable is odd, so added together, answer will be odd.

answer= none

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alexdallas: Master | Next Rank: 500 Posts; Posts: 108; Joined: Sun Mar 15, 2009 2:04 pm

by alexdallas » Mon Jul 06, 2009 2:15 pm

true...tks.

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