Question

32 Look at this series:
7. 13, 31, 98, 397,?
What number should come next?​

Answer 1

Answer:

7, 7×1+6, 13×2+5, 31×3+4, 97×4+3, 397×5+2, 1987×6+1,

Answer 2

The answer is 1990.

Step-by-step explanation:

The series is $13, 31, 98, 397,?$

• 31 is five more than two times 13.

Hence, it can be written as $(13\times 2) + 5$

• 98 is five more than three times 31.

Hence, it can be written as $(31\times 3) + 5$

• 397 is five more than four times 98.

Hence, it can be written as $(98\times 4) + 5$

• Thus, the next number in the series would be five more than five times 397, that is $(397\times 5) + 5 = 1985+5 = 1990$

Hence, the next number in the series would be 1990.