Question

13,4,17,7,25,10,?,13,73​

Answer 1

Answer:

13+4*1=17

17+4*2=25

25+8*2=41

41+16*2=73

?=41

Answer 2

13,4,17,7,25,10,41,13,73​

Here we can observe a pattern between the alternate numbers.

First, we will take the even alternates positions

4,7,10,13

we can see that in these numbers there is a difference of 3 between them so this is a separate pattern.

Now we will take the odd alternates positions

13,17,25,?,73

Here we can observe the pattern by taking the difference between the terms

17 - 13 = 4

25 - 17 = 8

73 - 25 = 48

From the first two differences, we can see that the difference is doubling after every term.

If we according to this pattern the difference between 25 and the unknown term should be 16, and the difference between 73 and the unknown term should be 32. By adding these two differences we will get the observed difference of 48.

Therefore the unknown term will be 25 + 16 = 41

Therefore the unknown term will be 41.