What will come in place of the question mark (?) in the following number series? 4, 16, 36, 64, ? MCQ with Answer and Explanation

Explanation:
The differences between consecutive terms are: 3-1=2, 6-3=3, 10-6=4, 15-10=5. The differences are increasing by 1 each time. The next difference should be 6. Therefore, the next term is 15+6=21.[reference:1]

Explanation:
The series consists of squares of consecutive integers: 1², 2², 3², 4². The next term is 5²=25.

Explanation:
The differences are: 5, 7, 9, 11, 13 (consecutive odd numbers). The missing term is 23+11=34.[reference:15]