Question

3, 4,7, 7, 15, 13,31, ?
Find replacement for question mark​

Answer 1

Answer:

25

Step by Step Explanation:

This sequence is a combination of 2 patterns.

1st sequence = 3, 7, 15, 31...

2nd sequence = 4, 7, 13...

In the 1st one the pattern is as follows:

3 + 4 = 7

7 + 8 = 15

7 + 16 = 31

We are adding two times the previously added number eg, 4 × 2 = 8 and 8 × 2 = 16

In the 2nd sequence, the pattern is as follows:

4 + 3 = 7

7 + 6 = 13

13 + 12 = 25

In this sequence we are also adding two times the previously added number eg, 3 × 2 = 6 and 6 × 2 = 12.

Hence, the answer is 3, 4, 7, 7, 15, 13, 31, 25