Find the number of ways in which the birthday of six different persons will fall in exactly two calendar months.

Find the probability that the birth days of six different persons will fall in exactly two calendar months.

Find the probability that the birth days of six different persons will fall in exactly two calendar months.

Find the probability that the birth days of six different persons will fall in exactly two calendar months.

There are seven even greeting cards each of a different colour and seven envelopes of the same seven colours. Find the number of ways in which the cards can be put in the envelopes so that exactly four of the cards go into the envelopes of the right colour.

Find the number of ways in which 12 different beads can be arranged to form a necklace.

Find the number of ways in which the number 94864 can be resolved as a product of two factors.

Find the number of ways in which the number 94864 can be resolved as a product of two factors.

Find the number of ways in which 10 different diamonds can be arranged to make a necklace.

Find the number of ways in which n different prizes can be distributed among m(< n) persons if each is entitled to receive at most n-1 prizes.

n different toys have to be distributed among n children. Find the number of ways in which these toys can be distributed so that exactly one child gets no toy.