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Negative Numbers and Integers — Maths STD 6 — Question

Maharashtra BoardEnglish MediumSTD 6MathsNegative Numbers and Integers1 Mark
Question
(-22) + 21 + (-22) + 21 + ....... + 20 terms is equal to .......
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Answer

$\because$ (-22) + 21 = -(22 - 21) = -1
$\therefore$ (-22) + 21 + (-22) + 21 + ... + 20 terms = (-1) + (-1) + (-1) + ... + 10 terms
= 10 × (-1)
= -10

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