What is the value of 12 - 22 + 32 - 42 + 62 - 52 + 82 - 72 ?
Expression : 12 - 22 + 32 - 42 + 62 - 52 + 82 - 72
= $$(12-22)+(32-42)+(62-52)+(82-72)$$
= $$(-10)+(-10)+(10)+(10)$$
= $$20-20=0$$
=> Ans - (D)
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