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Hots question. no:3 solve |
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Answer» LET's SOLVE it by Arithmetic Progression. This series will form an A.P as first term is 1, SECOND is 3 , third is 5 and so on. By this way the common difference will be 2. Given, a = 1 common difference = 2 Number of terms = 13. Sum of all terms = N/2 [ 2a + ( n - 1 ) d ] = 13 / 2 [ 2 * 1 + ( 13 - 1 ) 2 ] =13 / 2 [ 2 + 12 * 2 ] = 13 / 2 ( 2 + 24 ) = 13 / 2 * 26 = 13 * 13 = 169. |
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