Question

Find the sum of the first 100 terms of the series in which tn = 2n - 1, n=1,2,3,...

Answer 1

find the first term a1, put n=1 in an, what u get ?

Answer 2

n=1 in tn*

Answer 3

are u there @jufrando

Answer 4

yeah sorry i was on another question

Answer 5

so whats t1 ?

Answer 6

so the question will tn= 2(1) -1? which is 1

Answer 7

will be*

Answer 8

yup, t1=1=1st term
now find last term, t100, buy putting n=100

Answer 9

thanks, so the answer is 199?

Answer 10

thats last term = t100 = 199, answer is the sum given by
S= n/2(1st term + last term)

Answer 11

s= 100/2 (t1+t100)

Answer 12

oh ok i get it now thank you, which equals to 10,000

Answer 13

yup.