In how many ways first and second rank in mathematics, first and second rank in physics, first rank in chemistry, and first rank in English be given away to a class of 30 students.

A class has 30 students. The followign prizes are to be awarded to the students of the class- first and second in mathematics, first and second in Physics, first in Chemistry and first Biology. If N denote the number of ways in which this can be done, then

Name the first and second elements of groups 14.

In how many different ways the following 5 prizes be distributed among 10 students? First and second in Mathematics; first and second in physics and first in Hindi.

The correct difference between first and second order reactions is that

In which case first has lower melting point than second ?

Can we always call the second harmonic as the first overtone? Give examples.

In how many ways can 20 articles be packed in the parcels so that the first contains 8 articles, the second 7 and the third 5?

Why is the second resonance found feebler than the first ?

In which case second has lower boiling point than first ?

How would you account for the irregular variation of ionization enthalpies (first and second) in the first series of the transition elements ?