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9 June, 11:53

What is the value of the 11th term in the following geometric sequence?

-5, - 10, - 20, - 40

-5,120

-100

-180

-19,531,250

+1
Answers (2)
  1. 9 June, 12:12
    0
    we are given the geometric sequence - 5, - 10, - 20, - 40. The geometric factor of this sequence is equal to 2. In this case, the formula is expressed: an = - 5 * (2) ^ (n-1) where n is an integer. In this case, a11 is equal to - 5 * (2) ^ (11-1) equal to - 5120.
  2. 9 June, 12:15
    0
    The geometric sequence above is - 5*2^ (x-1)

    plugging in 11 we get - 5*2^10

    which is - 5120
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