Question

Find missing series
21,29,32,43,57,82,?

Answer 1

Answer:

45 is the answer. It goes as follows..

12 + 9 = 21

21 + 2 = 23

23 + 9 = 32

32 + 2 = 34

34 + 9 = 43

So 43 + 2 = 45..

Answer 2

The answer is 121.

Step-by-step explanation:

The series is $21, 29, 32, 43, 57, 82, ?$

Let us calculate the difference between the two consecutive numbers:

• $29-21 = 8$
• $32-29 = 3$
• $43-32 = 11$
• $57 - 43 = 14$
• $82 - 57 = 25$

If we observe closely we find that the sum of differences of two sets is equal to the third difference.

That is,

• $8+ 3 = 11$
• $3+11 = 14$
• $11+14 = 25$

SO, the next number would be $14+ 25 + 82 = 121$

Hence, the missing number is 121.