A) 120
B) 90
C) 100
D) 80
Correct Answer: C
Solution :
1 girl and 6 boys \[{{=}^{4}}{{C}_{1}}{{\times }^{6}}{{C}_{6}}=4\] 2 girls and 5 boys \[{{=}^{4}}{{C}_{2}}{{\times }^{6}}{{C}_{5}}=36\] 3 girls and 4 boys \[{{=}^{4}}{{C}_{3}}{{\times }^{6}}{{C}_{4}}=60\] Hence total ways\[60+36+4=100\].
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