In a group of 1 boy and 9 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be selected?	Select:	A) 60	B) 68	C) 76	D) 84	E) 92
Number of ways to select four children is 10C4 = 210   Number of ways to choose only girls is 9C4 = 126   Number of ways that at least one boy is selected is  210 - 126= 
<gadget id="calculator"> 210 - 126</gadget>
<output>84</output>
84   The answer is 84.
<result>D</result>
In a group of 1 boy and 9 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be selected?