PDF chapter test TRY NOW
1. If \(a_n = 3-4n\), show that \(a_1\), \(a_2\),\(a_3\),... form an AP. Also find \(S_{20}\).
The given \(a_n\) is .
\(S_{20} = \).
2. In an AP, if \(S_n = n(4n+1)\), find the AP.
The sequence of an A.P. is , , , , ,...
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