Question

what is the next number in the sequence 1, 1, 2, 3, 5, 8, 13, ...
A)17
B) 20
C) 21
D) 24

Answer 1

how is the third term related to the first and second?

Answer 2

Hint: this is the famous Fibonacci sequence

Answer 3

this is the fibonacci series

Answer 4

How is the fourth term related to the second and third?

Answer 5

think sum

Answer 6

Allie, what have you tried?

Answer 7

No, not 20. That's a guess.

Answer 8

Listen to Tonks, he's putting you on the right track.

Answer 9

21

Answer 10

Tonks is telling you to find a pattern between any 3 successive numbers. That will lead you to the right answer without just giving you a number. You will then see the underlying basis for this very famous sequence. Give Tonks some credit.