Question

Another tricky problem..

@jim_thompson5910

Answer 1

This is all I know:
at 1st=1
at 2nd=1+5=6
at 3rd=6+7=13
at 4th=13+9=22
at 5th=22+11=33
at 6th=33+13=46
at 7th=46+15=61

Answer 2

the 2nd term is when n = 2

notice we're adding 5 to the first term (1) to get the second term (6)

Answer 3

so let's assume the answer is choice A

that says "take the previous term and add n to it to get the next term"

but n = 2 and we are not adding 2, we're adding 5

Answer 4

so do you see how I eliminated choice A?

Answer 5

I see, yes ! Progress is looking good! :)

Answer 6

try out choice B

Answer 7

How?

Answer 8

notice we're now adding on 4n+1 to the previous term to get the next term

Answer 9

N= 5 , correct?

Answer 10

let's go back to choice A