Question

its number series question.....20,80,30,60,40,?,50,20...how to solve it..please explain me..​

Answer 1

In this series two mix series first is
20 30 40 50 .... (+ 10 ) in each term
and second
80 60 40 20 ...(-20) in each term
So ans is 40

Answer 2

20, 80, 30, 60, 40, 40, 50, 20.

Given,

A sequence of numbers.

20, 80, 30, 60, 40, ?, 50, 20.

To Find,

The missing number.

Solution,

Here, a sequence of numbers is given.

We need to find out the missing number.

The series is 20, 80, 30, 60, 40, __, 50, 20.

Let's consider the sequence as two parts.

take alternate numbers.

20, 30, 40, 50.  Here the numbers are incrementing by 10.

The next set of numbers is 80, 60, _, and 20.

Here, the numbers are decreasing by 20.

80 - 20 = 60.

60 - 20 = 40.

40 - 20 = 20.

Hence, 40 is the missing number.

#SPJ2