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find the sum of the first 20 terms of an A.P whose common different is 3 times of its first term and its 5th term is 26 |
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Answer» Step-by-step EXPLANATION: t5=a+4d=26 d=3a a+4*3a =26 13a = 26 a=2 d=6 sum of 20 TERMS = 20/2 *(2*2+[20-1]6) sum of 20 terms = 1180 |
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