In a group of 6 boys and 4 girls, four children are to be selected. In how many ways can they selected that at least one boy should be there? Select
A) 159	B) 194	C) 205	D) 209	E) 140
We may have( 1 black and 3 girls) or (2 boys and 2 girls) or (3 boys and 1 girl) or (4boys)   =(6c1 x 4c3)+(6c2 x 4c2)+(6c3 x 4c1)+6c4   =24+90+80+15= 
<gadget id="calculator">24+90+80+15</gadget>
<output>209</output>
209   ANSWER 209 209
<result>D</result>
In a group of 6 boys and 4 girls, four children are to be selected. In how many ways can they selected that at least one boy should be there?