Solve this:
Q.71. Find (- 1) × (- 1) × ...... 2 m times, m is a natural number?
(A) - 1
(B) 1
(C) 2
(D) - 2

Dear Student,

The solution is as under:

-1×-1×-1×......2m timesor, =-12m      in exponents, when base is same, power is added, am×an=am+nNow, as m is a natural number, and natural numbers are integers which starts from 1 and goes upto infinity,hence 2m will be an even integeror, =-12m=1     as -1even int=1

Hope this information will clear your doubts about the topic.

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