What is the value of $$(1 \times 2 + 2 \times 3 - 3 \times 4 + 4 \times 5 - 5 \times 6 + 6 \times 7)$$?
=Â $$(1 \times 2 + 2 \times 3 - 3 \times 4 + 4 \times 5 - 5 \times 6 + 6 \times 7)$$
= (2+6-12+20-30+42)
= (2+6+20+42-12-30)
= (70-42)
= 28
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