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प्रश्न
Without doing the actual addition, find the sum of:
1 + 3 + 5 + 7 + 9 + ……………… + 39 + 41.
उत्तर
1+3 + 5 + 7 + 9 + ……….. + 39 + 41
= Sum of first 21 odd natural numbers = 212 = 441
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