How do I do this? I tried to find the common ratio for G.P. and then substitute it to find the 20th term but, still have 2 unknown terms. Please help!
first term: a
2nd term a+d and ar
so, a+d = ar
r = 1 + d/a
So, pick an a&d, say 1&2.
If no other information is given, that's about as far as we can go.
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