请问这一道排列组合中C42的用意是什么?

请问这一道排列组合中C42的用意是什么?

code. algorithm. math.

difficult.

include other information.

simulation. algorithm. Note.

step 1. 4 from 6.

one male. 2×4=8.

two male. 1×comb(4,2)=6.

step 1. 4 from 6. (8+6=)14.

step 2.

each one is for one target.

each target has one person.

A,B,C,D. a,b,c.

add calculation sequence.

output control.

(1+1+1):1.

step 2.1. 2 person target. 3.

step 2.2. 2 from 4. for 2 person target.

comb(4,2)=6.

step 2.3. 2 person. for 2 target. 2.

step 2. 3×6×2=36.

answer: 14×36=504.

difficult. with a gift.