If tr=2 r2+3 then displaystyle∑r=110 tr is

Question

If tr=2 r2+3 then displaystyle∑r=110 tr is (A) 800 (B) 770 (C) 740 (D) 720

Tardigrade Admin · Accepted Answer

displaystyle∑r=1n tr=2 displaystyle∑r=1n t2+ displaystyle∑r=1n 3=(2 n(n+1)(2 n+1)/6)+3 n Put n=10

Q. If $t_{r} = 2 r^{2} + 3$ then $r = 1 \sum 10 t_{r}$ is