Question :
Directions: Which number will replace the question mark (?) in the following series?
729, 243, ?, 27, 9, 3
Option 1: 54
Option 2: 78
Option 3: 81
Option 4: 36
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Correct Answer: 81
Solution :
Given:
729, 243, ?, 27, 9, 3
The power of 3 is decreased by 1 in each number, to get the required missing number –
729 = 3
6
; 243 = 3
5
; 81 = 3
4
; 27 = 3
3
; 9 = 3
2
;
3 = 3
1
So, 81 is the missing number in the series. Hence, the third option is correct.
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