Question

how to solve the number series of 15,45,20,42,25,39

Answer 1

an alternate series is going on

15,20,25,30

and

45,42,39,36...and so on

first one has (+5) and second has (-3)

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Answer 2

15,45,20,42,25,39; - In this question , two types of series is given here.

Type -1

15 + 5 =20

20 +5 = 25

25+ 5 = 30

30 + 5 = 35

35 + 5 = 40

Increasing by 5 in each number, this series will continue.

Type -2

45 -3= 42

42- 3 = 39

39- 3 = 36

36 -3 =33

33 -3 = 30

Decreasing by 3 in each number, this series will continue.

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