XCy means that X is a superscript and Y is a subscript.
XPy refers to the arrangement in which x is superscript and y is subscript.
Solution: The number of all combinations is 2C5.
1. The combination of all boys is 2C3.
So the probability is 2C3/2C5=3/ 10=0.3.
2. The combination of a man and a woman is 1C3* 1C2.
So the probability is1C3 *1C2/2c5 = 6/10 = 0.6.