Fill in the blank by suitable letters.
a_c_ba_ca_cb

Which of the following numbers will replace the question mark (?) in the given series?

58, 179, ?, 492, 688

A series is given, with one term missing choose the correct alternative from the given ones that will complete the series.
1, 9, 25, 81, 329,  ? 

Find the next term in the following series.
Z26, X24, V22, ____

A letter series is given below in which some letter are missing. Select the  option that gives the letters that can fill these blanks in that order.
a_ca_bab_ad_abc_db

Complete the following alphabet series.
ZA : YB :: YC :?

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
K6V, M12U, O18T,?

What should be the missing term in the following number series?
61, 67, 71, 73, 79, 83, __, 97,