Question

5. Find the missing term in the series 3, 6, 15, __, 123 a. 30 b. 42 c. 24 d. 81

Answer 1

i think the missing no. is 42

Answer 2

First, you add 3^0, which is 1. You get 3

Then you add 3^1, which is 3. You get 3+3 = 6

Then you add 3^2, which is 9. You get 6+9=15

Then you add 3^3, which is 27. You get 15+27, which is 42.

Answer is option b) 42