How do you find a1 given an = 24, r = 2/3, n = 4?

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Answer 1 · 2016-09-26T13:45:35

This question is not clear about where the sequence is geometric or arithmetic.

The nth term of a geometric sequence is given by #t_n = a xx r^(n - 1)#.

#24 = a xx (2/3)^(4- 1)#

#24 = a xx 8/27#

#a = 24/(8/27)#

#a = 81#

Hopefully this helps!