first term is 440 and 12th term is 880. find S6. so a= 12 r^11 =2 (i think some thing wrong on my calculation ) need help
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Originally Posted by nikk first term is 440 and 12th term is 880. find S6. so a= 12 r^11 =2 (i think some thing wrong on my calculation ) need help First term = a = 440. 880 = a r^11 = 440 r^11 => r^11 = 2 => r = ....? Now substitute a, r and n (= 6) into the sum formula.
it look like my ans up to here still correct First term = a = 440. 880 = a r^11 = 440 r^11 => r^11 = 2 => r = ....? so..my last ans is 3108.36 any one can reconfirm it back
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