this is mental ability question for NTSE

find the missing number

8,108,24,36,72,?,216

Dear Student!

The given numbers are 8, 108, 24, 36, 72, ?, 216.

Consider the circled numbers 8, 24, 72 and 216.

24 = 8 × 3

72 = 24 × 3

216 = 72 × 3

Here, the numbers are obtained by multiplying the previous number by 3.

Now consider the un circled numbers 108, 36, ?

Here, the numbers are obtained by dividing the previous number by 3.

Thus, the missing number is 12.

Cheers!

  • 0

 See this is a combination of two series

1) 8 , 24, 72, 216

In this 8 * 3 = 24 , 24 * 3 = 72 and , 72 * 3 = 216

Now the second series

2) 108 , 36 , ?

In this 108 / 3 = 36 , 36 / 3 = 12

So the missing number is 12

  • 0

the no. is 12...!!! it divide by3 den multiply by 3

  • -1
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