Which of the following numbers will replace the question mark (?) in the given series?
5, 6, 10, 12, 15, ?, 20, 24
A19
B18
C20
D21
A19
B18
C20
D21
Related Questions:
Select the option that represents the letters that, when placed from left to right in the same sequence in the blanks below, will complete the letter series.
B_XT_ _HY_MB_Z _M