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प्रश्न
Without doing the actual addition, find the sum of:
1 + 3 + 5 + 7 + 9 + ……………… + 39 + 41.
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उत्तर
1+3 + 5 + 7 + 9 + ……….. + 39 + 41
= Sum of first 21 odd natural numbers = 212 = 441
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संबंधित प्रश्न
What will be the unit digit of the square of the given number?
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The cost of levelling and turfing a square lawn at Rs 2.50 per m2 is Rs 13322.50. Find the cost of fencing it at Rs 5 per metre.
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Evaluate: 372 – 362
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1 + 3 + 5 + 7 + 9 + ………………… + 51 + 53
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