Question

1. Find the sum of the series15∑ (2n-1) n-1. Show your work.​

Answer 1

$\\ \rm\Rrightarrow \sum^{15}_{n=1}2n-1$

$\\ \rm\Rrightarrow 2(1)-1+2(2)-1\dots+2(15)-1$

$\\ \rm\Rrightarrow 1,3,5\dots 29$

Sum of first 15 odd nos

• n²
• 15²
• 225