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scoundrel [369]
3 years ago
5

What is the sum of the geometric sequence -3,18,-108,.. if there are 7 terms?

Mathematics
1 answer:
andreev551 [17]3 years ago
5 0

Answer:

S_{7} = - 119973

Step-by-step explanation:

The sum to n terms of a geometric sequence is

S_{n} = \frac{a(r^n-1)}{r-1}

where a is the first term and r the common ratio

Here a = - 3 and r = 18 ÷ - 3 = - 6 , thus

 S_{7}   = \frac{-3(-279936-1)}{-6-1}

    = \frac{-3(-279937)}{-7}

    = \frac{839811}{-7}

     = - 119973

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