Question

Select the number that can replace the question mark (?) in the following series. 17, 21, 30, 46, 71, ?

• A. 96
• B. 105
• C. 107
• D. 101

Answer 1

Answer:

C. 107

$17+2^2=21$

$21+3^2=30$

$30+4^2=46$

$46+5^2=71$

$71+6^2=107$