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Permutations And Combinations
If the GP.’s 5,10, 20, .......and 1280, 640, 320, ......have their nth terms equal, find the value of n.
The first G.P. is : 5, 10, 20,...........
Here, a = 5,
nth term =
The second G.P. is: 1280, 640, 320, ...........
Here, a = 1280,
nth term =
Since the nth terms of both the G.P.'s are equal
∴
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