Question

,./.

Answer 1

do you want an explanation or just the answer?

Answer 2

answer preferably @ArkGoLucky

Answer 3

first one is 495, but that's not an answer choice...

Answer 4

does the series start at 12?

Answer 5

second one is -134338567022

Answer 6

yes it starts at 12.. i think we have to find the 15 terms first..

Answer 7

which answer choice is the second one?

Answer 8

I guess the second one would be your second answer choice

Answer 9

I think you left out the exponent symbol. should be 10^11

Answer 10

yes.. they are exponents..sorry

Answer 11

in the first question, the first 15 terms are:
{12+15+18+21+24+27+30+33+36+39+42+45+48+51+54}

Answer 12

you try adding them in a calculator

Answer 13

*can

Answer 14

i have to add all of them to get the sum?

Answer 15

well no, there is a formula but if don't trust my answer (as my answer is not among the choices you gave me) you can try grinding out the answer

Answer 16

well its multiple choice so it has to be one of them.. are you sure you are reading the question correct?

Answer 17

well all I'm getting is that it wants me to add the first 15 terms. that's what I did. try adding all the terms

Answer 18

what do you think @mathstudent55 ?

Answer 19

Well the original question is "Which of the following is the sum of the first 15 terms of the series made from the sequence 3, 6, 9,...."

Answer 20

I had to Find the next three terms of 3, 6, 9,....

Answer 21

and thats how i got 12, 15, 18

Answer 22

that changes everything. then the start if the series is not 12, its 3

Answer 23

the answer's 360

Answer 24

Thanks!

Answer 25

so which one is number 2?

Answer 26

b

Answer 27

Thank you for the help! :)

Answer 28

welcome