Let {a}_{1}, {a}_{2}, {a}_{3}, \.... be an arithmetic progression with non-zero common difference. It is given that \\sum_{i=4} ^{12} a_{i}=63 and {a}_{{k}}=7 for some {k}. Then the value of {k} is

UPSEE 2019 Solved Paper

Question : 112 of 150

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Let a1,a2,a3,.... be an arithmetic progression with non-zero common difference. It is given that

∑

i=4

ai=63 and ak=7 for some k. Then the value of k is

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