1.

Let a1,a2,a3,⋯ be an arithmetic progression with npn-zero common difference. It is given that 12∑i=4ai=63 and ak=7 for some k. Then the value of k is

Answer»

Let a1,a2,a3, be an arithmetic progression with npn-zero common difference. It is given that 12i=4ai=63 and ak=7 for some k. Then the value of k is



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