1)Find the permutation and combination of the letters a, b, c, d
taking 2 at a time.
Verify your answers with the permutation & combination
formula.2)
2.An urn contains 10 marbles. 3 blues, 4 yellow and 3 red
marbles. 6 marbles is selected at random. Find the probability of
picking 1 blue, 3 yellow marbles and 2 red ones.
3) A computer operator has to issue passwords made up of a
letter followed by two digits. How many passwords are...