Question

Find the missing number in the series.
2, 8, 5, 6, 8, ..., 11​

Answer 1

Answer:

4 is the correct answer for this question.

Answer 2

The missing number is 4.

GIVEN

Number series: 2, 8, 5, 6, 8, ..., 11

TO FIND

Missing number

SOLUTION

We can simply solve the above problem as follows;

We can observe that the digit at the even place are decreasing by 2 and the digits at odd places are increasing by 3

When n is odd

$aₙ = a₁ + 3( \frac{n - 1}{2} )$

When n is even

$aₙ = a₂ + - 2( \frac{n}{2} - 1)$

n = 6

= 8- 2(3-1)

= 4

Hence, The missing number is 4.

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