Four words have been given out of which three are alike in some manner, while one is different. Choose the odd one.

Which is the next term in the following sequence of letter clusters?
PLaN, OJbP, NHcR, MFdT, LDeV,

Which number will come in place of question mark in the following number series?
4,7, 12, 21 , 38,?

Direction: Study the following information carefully and answer the questions given beside:

Six persons – Rashmi, Mahi, Rahul, Jyotika, Raja, and Abhisek were living in a building of six floors. Each of these persons owns a different car – Jaguar, Audi, Ferrari, BMW, Bentley and Tesla, but not necessarily in the same order. The bottom floor of the building was numbered as 1, the floor above it was numbered as 2 and so on.
There were 2 floors between Abhisek and the one who owns Ferrari. Abhisek lives below the one who owns Ferrari. The one who owns Tesla lives just above the one who owns Ferrari. Rashmi owns Audi and there were 2 floors between Rashmi and Raja. There was 1 floor between Jyotika and the one who owns Jaguar. Jyotika lives above the one who owns Jaguar. There were 2 floors between Mahi and the one who owns BMW. Mahi lives above the one who owns BMW. Mahi and Rashmi were living on consecutive floors.

Who among the following owns Tesla?

Select the option in which the words share the same relationship as that shared by the given pair of words.
Bank : River :: ? : Sea

QAR, RAS, SAT, TAU, ? 

In a group of 100 people, 50 people like to eat Chicken and 25 people like to eat both Chicken and Mutton. Everyone in the group likes at least one of the two. How many people like mutton only -

Ram was twelve times as old as his son twenty years ago. Now he is twice as old as his son. What are the present ages of the son and Ram?