1

### IIT-JEE 1985

Subjective
7 relatives of a man comprises 4 ladies and 3 gentlemen ; his wife has also 7 relatives ; 3 of them are ladies and 4 gentlemen. In how many ways can they invite a dinner party of 3 ladies and 3 gentlemen so that there are 3 of man's relatives and 3 of the wife's relatives?

## Answer

485
2

### IIT-JEE 1983

Subjective
m men and n women are to be seated in a row so that no two women sit together. If $$m > n$$, then show that the number of ways in which they can be seated is $$\,{{m!(m + 1)!} \over {(m - n + 1)!}}$$

## Answer

solve it.
3

### IIT-JEE 1981

Subjective
Five balls of different colours are to be placed in there boxes of different size. Each box can hold all five. In how many different ways can be place the balls so that no box remains emply?

## Answer

300
4

### IIT-JEE 1978

Subjective
Six X' s have to be placed in the squares of figure below in such a way that each row contains at least one X. In how many different ways can this be done.

## Answer

26

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