In a group of 6 boys and 4 girls 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.
A) 209	B) 200	C) 210	D) 225	E) 221

Rationale: no of boys = 6 no of girls = 4 therefore , no of ways at least 1 boy can be selected = 6 c 4 * 4 c 0 + 6 c 3 * 4 c 1 + 6 c 2 * 4 c 2 + 6 c 1 * 4 c 3 = 15 + 80 + 90 + 24 = 209 ans - a
Answer: A