In a group of 6 male and 4 female, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there? Choose the correct choice from the following answers:
A) 200 B) 209 C) 207 D) 300 E) 350
req no = 6C1*4C1 + 6C2*4C1 + 6C4   ==6C1+4C1 + 6C2+4C2 + 6C3*4C1 + 6C4   (6*4) + (6*5/2*1 * 4*3/2*1) + 6*5*4/3*2*1*4 + 6*5/2*1   ==&gt; 209   ANSWER 209
<result>B</result>
In a group of 6 male and 4 female, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?