1. In a group of 6 boys and 4 girls, how many ways can four persons be selected, such that at least one boy should be there?
a. 159
b. 194
c. 205
d. 209
EXPLANATION
At least one boy = Total – No boy
Total = 10C4 = 210 ; No boy = 4C4 = 1
At least one boy = Total – No boy = 210 – 1 = 209
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