Verbal Reasoning - Mental Ability Questions

A series is given, with one word missing. Choose the correct alternative from the given ones that will complete the series.
Oxygen, Toil, Arouse, Arson, Tenuous, ?

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

M_P_M_R_PM_PM_RR_P

Which set of letters when sequentially placed at the gaps in the given letter series shall complete it?

_BA_BBA_AB_B

If "α" denotes "subtracted from", "β" denotes "multiplied by", "θ" denotes "added to" and "δ" denotes "divided by", then 10 θ 8 β 4 δ 8 α 9 = ?

Raju's position in a row is 13th from the front side and 6th from the back side. How many people are standing in that row?

If C is coded 3 , DASH is coded as 32 , then DANCE will be coded as

If 40@8 = -5, 30@3 = -10 and 20@5 = -4, then find the value of 60@3 = ?

What should come in place of the question mark (?) in the following number series? 1, 3, 24, 360,8640, 302400, ?