Question

Find the number that fits:2, 5, 10, 17,?

• A. 26
• B. 24
• C. 21
• D. 20

Answer 1

Answer:

A. 26

Observe the pattern:

$2, 5, 10, 17, \ ?$

Find the differences:

5-2=3
10-5=5
17-10=7
The differences are consecutive odd numbers:

3, 5, 7

Next difference should be:

9

So,

17+9=26

Therefore, the missing number is:

$\boxed{26}$