Starting from (-1) * 5 write various products showing some pattern to show (-1) * (-1) = 1

Starting from (-1) * 5 write various products showing some pattern to show (-1) * (-1) = 1

According to the pattern,
(−1)×(5)=−5
(−1)×(4)=−4
(−1)×(3)=−3
(−1)×(2)=−2
(−1)×(1)=−1
(−1)×(0)=0
(−1)×(−1)=1

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