The chief source of naphthalene

17 21 51 169 701 ?

4, 9, 24, 69, ?, 609

69, 35.5, 39.5, 68.25, 152.5, ?

  5, 6, 14, 45, 184,  ?   

What will come in place of the question mark (?) in the following series?

325, 292, 262, 229, ?, 166

120, 120, ?,  360, 900, 2700

18, 22, 28, 38, 54, ?,

What will come in place of the question mark (?) in the following series?

45, 68, 114, 183, 275, ?

What will come in place of the question mark (?) in the following series?

112, 116, 121, ?, 134, 142

Choose the missing term.

3F, 6G, 11I, 18L,?