Find the sum of first 25 terms of arithmetic sequence 4,9,14,19,24

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25-06-2015
Math

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Find the sum of first 25 terms of arithmetic sequence 4,9,14,19,24

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Cyrishidn Cyrishidn · Answer 1 · 2015-06-25T14:58:28+08:00

Cyrishidn Cyrishidn

25-06-2015

An is 4, 9, 14, 19, 24, ....of the form a, a+d, a+2d, ...., A1 + (n-1)d, +..... Here, a =4, d = 5 and the sum of the
first n terms is (n/2)[2a + (n-1)d]. For n = 25 this equals (25/2)[2(4) + (25 - 1)(5)] = (25)[4 + 60] = 1600.

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