What would be the next number in the series  

  9, 8, 18, 6, 36, 4, 72, 2, 144, ?  

The primitive atmosphere was reducing because:

If 3$8 = -50, 3$5 = -20 and 2$3 = -10, then find the value of 9$1 = ?

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

A is shorter than B but taller than C. D is shorter than A but taller than C and E is shorter than B but taller than A. The shortest person is ?

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

XFB,UGD ,RIG ,OLK, ?

Gopal is older than Mohan but younger than Ram. Mohan is older than Sohan but younger than Ram. Who is the oldest?

In the following question, two statements are given each followed by two conclusions I and II. You have to consider the statements to be true even if they seem to be at variance from commonly known facts. You have to decide which of the given conclusions, if any, follows from the given statements.

Statement:
(I) Only first division holders are admitted.
(II) Ram is a first division holder.

Conclusions:
(I) Ram is admitted.
(II) Only Ram is admitted.

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

PMT, OOS, NQR, MSQ, ?