Question

what will come in the following series 20 25 23 28 26 31 29 34 _? answer is 31. please explain how?? urgent pls​

Answer 1

Step-by-step explanation:

20+5=25 25-2=23. 23+5=28. 28-2= 26

that is +5 then -2

Answer 2

Step-by-step explanation:

What is the next number in this series: 23, 21, 24, 19, 26, 15, 28, 11, 30, 7, and 36?

In these series , prime numbers must be used in opertions(subtraction followed by addition ).

Prime numbers 2,3,5,7,11,13,17,19,23,29,31.

1 is not a prime number & 2 is the only even prime number .

23 -2 = 21 ( subtraction)

21 +3 =24 (add)

24 - 5 = 19(sub)

19 + 7 =26(add)

26 - 11 =15 ( sub )

15 + 13 =28 (add)

28 - 17 =11 (sub)

11 + 19=30 (add)

30 - 23 =7 (sub)

7 + 29=36 (add).

36 - 31 =5 (Subtraction)

Ans : 5