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OpenStudy (anonymous):
Find an explicit rule for the nth term of a geometric sequence where the second and fifth terms are -6 and 162, respectively.
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OpenStudy (ranga):
Geometric sequence: a, ar, ar^2, ar^3, ar^4, ar^5, ..... ar^(n-1) second term = ar = -6 fifth term = ar^4 = 162 solve for a and r. nth term will be: ar^(n-1)
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