In a G.P the 8th term is 640 and 11th term is 5120,then find the first term and common ratio
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Answer:
first term = 5
common ratio = 2
Step-by-step explanation:
8th term = ar^7 = 640
11th term = ar^10 = 5120
r^10 / r^7 = 5120/640
r^3 = 8
r = 2
a (2)^7 = 640
a (128) = 640
a = 5
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