Three numbers a, b and c are co-prime to each other

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

NLJ, JHF, FDB, BZX,? 

Four of the following five are similar in a certain way, which creates a group. 

Which of these is not related to this group? 

U, R, Y, S, W

When the mirror is placed on 'PQ' as shown, select the correct mirror image of the given combination. 

Which of the following letter-clusters will replace the question mark (?) in the given series?

RI, PK, LO, FU, XC, ? 

Read the given statement and conclusions carefully and decide which of the conclusions logically follow(s) from the statement.

Statement:

What should come in place of '?' in the given series?

3  21  111  561  2811 ?

Three of the following four figure pairs are alike in a certain way and thus form a group. Which is the one that does not belong to that group?

Select the number from among the given options that can replace the question mark (?) in

        203, 199, 208, 192, 217, 181, ?

Which diagram correctly represents the relationship of pigeons, birds, dogs?

Select the option that is related to the third word in the same way as the second word is related to the first word.

Detective: Clues :: Scientist:?