1.

If x = -1, then the value of 1x991x99 + 1x981x98 + 1x971x97 + 1x961x96 + 1x951x95 + 1x941x94 + 1x1x - 1 is?

A. 1
B. 0
C. -2
D. 1
Answer» B. 0


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