Let S_n be the sum to n-terms of an arithmetic progression 3,7,11, . . . . . .. If 40< ( {6}/{ {\n}( {\n}+1)} \sum_{{ {\k}=1}}^{{ {\n}}} {\S}_{ {\k}}) < 42, then {\n} equals____ [30-Jan-2024 Shift 2]

JEE Main 30-Jan-2024 Shift 2 Solved Paper

Section: Mathematics

Question : 25 of 90

Marks: +1, -0

Let Sn be the sum to n-terms of an arithmetic progression 3,7,11,.......
If 40<(‌

n(n+1)

‌

∑

k=1

Sk)<42, then n equals____

[30-Jan-2024 Shift 2]

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