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anonymous
 one year ago
What is the sum of the geometric sequence −1, 6, −36, … if there are 7 terms?
anonymous
 one year ago
What is the sum of the geometric sequence −1, 6, −36, … if there are 7 terms?

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.1first work out the common ratio = second term / first term

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0ok so would that be 6?

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1then use the formula for sum of n terms Sn = a1 * (1  r^n)  1  r where a1 = first term and r = common ratio, n = number of terms

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Hmm then you would plug that in to get 39,991?
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