Question

Find the missing number.

$3,15,35,63,\_\_,143.$

• A. $75$
• B. $81$
• C. $99$
• D. $125$

Answer 1

The correct option is C $99$

Given series is $3,15,35,63,\_\_,143.$

Here, the numbers follow a pattern:

$15-3=12$

$35-15=20$

$63-35=28$

So, the difference is of $8$.

$12,20,28,36,44$

So, $63+36=99$

Hence, the missing number is $99$.