Find the G.P whose 5th and 8th term are 80 and 640 respectively
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5th term is 80, ar^4=80
8th term is 640, ar^7=640
Then:
a8/a5=640/80
ar^7/ar^4=8
r^3=2^3
r=2
Substitute r = 2 in (i), we get
a(2)^4=80
a=5
Hence the required GP is 5,10,20,40,80...
Hope it helps!
Answered by
3
Step-by-step explanation:
Vvggcddcvg. Ggff ggg गड ggg 9 f
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