Question

EVALUATE : ( -1) *(-1) * (-1) *............. (60 times)

Answer 1

(-1)×(-1)............(60 times) =1


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Answer 2

$( - 1) \times ( - 1) \times ( - 1) \times ( - 1)....(60 \: times)$
-1 is multiplied 60 times that is even number.
So,in even number minus sign is changed into plus sign.
$( - 1) \times ( - 1) \times ( - 1) \times( - 1)...(60 \: times) \\ = 1$