Question

What number is missing in the following series: 243, 81, 27, x, 3, 1? a. 12 b. 6 c. 9 d. 5 e. 7

Answer 1

C. 9

Explanation:

243 / 3 = 81

81 / 3 = 27

27 / 3 = u guessed it :D

you guessed it / 3 = 3

3 / 3 = 1

1 / 3 = 0.33333333333 (11 threes)

wait..

Answer 2

c. 9

Explanation:

This series can be defined as 3^x. Therefore the missing value is 3^2 or 9.

3^0 = 1

3^1 = 3

3^2 = 9

3^3 = 27

3^4 = 81

3^5 = 243