Gujarati
8. Sequences and Series
easy

यदि किसी श्रेणी के प्रथम $n$ पदों का योगफल $5{n^2} + 2n$ हो, तो उसका द्वितीय पद है|

A

$7$

B

$17$

C

$24$

D

$42$

Solution

(b) ${T_2} = {S_2} – {S_1}$

= $5{(2)^2} + 2(2) – \{ 5{(1)^2} + 2(1)\}  = 24 – 7 = 17$.

Standard 11
Mathematics

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