In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there? 159 194 205 209
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=6C1*4C3+6C2*4C2+6C3*4C1
=6C1*4C1+6C2*4C2+6C3*4C1
=6*4+15*6+20*4
=24+90+80
=194✓
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