Q1.find the sum of all odd natural no from 20 to 80.
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☆ Answers - 1500
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21 + 23 +25 + 27 + 29 + 31 + 33 + 35 + 37 + 39 + 41 + 43 + 45 + 47 + 49 + 51 + 53 + 55 + 57 + 59 + 61 + 63 + 65 + 67 + 69 + 71 + 73 + 75 + 77 + 79
= 1500
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