Question

find the missing number in the following 15,12,17,10,? 8,25​

Answer 1

Answer:

20 15.17.x25 are in same series different. I by 3

Answer 2

Answer:

19

Step-by-step explanation:

Here we have the series is

15,12,17,10, ?, 8, 25

Now, the difference between the each two numbers are

in between 15 and 12 is -3

in between 12 and 17 is +5

in between 17 and 10 is -7

so, the next difference between them will be +9 and the number is 19

now the difference between 19 and 8 is -11

so, the difference series is

-3, +5, -7, +9, -11

So, the answer will be 19.