Question

Which summation formula represents the series below?
5+ 7+ 9+ 11

Answer 1

Answer: B

Explanation:

Answer 2

second one

Explanation:

it is the second one , it has three expression starts with 5

when n=0 :2n+5=2(0)+5=5

n=1 : 2n+5=7

n=2: 2n+5=4+5=9

n=3: 2n+5=11