sum of §n§^3 and ∫n∫^2 be -7.91

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If §n§ represents the greatest integer just lower than n, and ∫n∫ represents the fractional value in n, then for what value of n will the summation of §n§^3 and ∫n∫^2 be -7.91?
(A) -2.97
(B) -2.30
(C) -2.03
(D) -1.97
(E) -1.70





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by deepaks04 » Tue Oct 12, 2010 6:24 am
Answer is E
-1.7 = -2+0.3

-2^3 + 0.3^2=-7.91