Question 51

What is the value of 12 - 22 + 32 - 42 + 62 - 52 + 82 - 72 ?

Solution

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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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