GIVEN THE FOUR LETTER A,B,C,D SELECT TWO LETTERS WITHOUT REPLACEMENT A- LIST OUT ALL THE OPTIONS FOR SELECTING ANY TWO LETTERS B- HOW MANY POSSIBLITIES ARE THERE FOR SELECTIG ANY TWO LETTERS WHERE...

GIVEN THE FOUR LETTER A,B,C,D SELECT TWO LETTERS WITHOUT REPLACEMENT A- LIST OUT ALL THE OPTIONS FOR SELECTING ANY TWO LETTERS

B- HOW MANY POSSIBLITIES ARE THERE FOR SELECTIG ANY TWO LETTERS WHERE ORDER IS IMPORTANT? (PERMUTATION)

C- HOW MANY POSSIBILITIES ARE THERE FOR SELECTING ANY TWO LETTERS WHERE ORDER IS NOT IMPORTANT? ( COMBINATION