without adding find the sum : (i) 1+3+5+ 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 (ii) 1+3+5+7+ +47 +49 (iii) 1+3+5+7+ + 97 + 99.
plz explain step by step
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Answered by
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3+5+ 7 + 9 + 11 + 13 + 15 + 17 + 19 + 21 = 120
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2
1+3+5+7+9+11+13+15+17+19 = 102 = 10×10 =100. So, 100 is the solution for the question number (ii).
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