How many combinations of three letters taken from letters (a, b, b, c, c, d) are possible?
Pick.
A) 10	B) 13	C) 35	D) 36	E) 56
So 4C3 for abcd - 4 choices   3 more for bb(a,c or d)   3 more for cc(a,b or d)   total 10   10ns :10
<result>A</result>
How many combinations of three letters taken from letters (a, b, b, c, c, d) are possible?