(− 22) + 21 + (− 22) + 21 + ... + 20 terms is equal to .............

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Solution

∵ (− 22) + 21 = − (22 − 21) = − 1
∴ (− 22) + 21 + (− 22) + 21 + ... + 20 terms = (− 1) + (− 1) + (− 1) + ... + 10 terms
= 10 $×$ (− 1)
= − 10

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