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Q.4 Starting from (-1) × 5, write various products showing some pattern to show (-1) × (-1) = 1
Answer :

The various products are,
= -1 × 5 = -5
= -1 × 4 = -4
= -1 × 3 = -3
= -1 × 2 = -2
= -1 × 1 = -1
= -1 × 0 = 0
= -1 × -1 = 1