Evaluate:
(i) (−1)×(−1)×(−1)×......60times.
(ii) (−1)×(−1)×(−1)×(−1)×.....75times.
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Solution
(i) (−1)×(−1)×(−1)×......60times=1because(−1)ismultipliedevennumberoftimes.
(ii) (−1)×(−1)×(−1)×(−1)×.....75times=−1because(−1)ismultipliedanoddnumberoftimes.