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The terms 140, a, 45/7 are the first, second and third terms, respectively, of a geometric sequence. If  a is positive, what is the value of  a?

 Oct 9, 2020
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[(45/7) / 140]^1/2 =3 / 14 - Common ratio

 

a = 3 / 14 * 140 = 30 - 2nd term.

 Oct 9, 2020

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