A) \[50\]
B) \[10\]
C) \[600\]
D) \[1300\]
Correct Answer: C
Solution :
Number of ways of selecting a boy in a class consisting of 20 boys and 30 girls \[{{=}^{20}}{{C}_{1}}\] Number of ways of selecting a girl in a class consisting of 20 boys and 30 girls \[{{=}^{30}}{{C}_{1}}\] Then, the total number of ways of selecting a boy and a girl from a class consisting of 20 boys and 30 girls \[{{=}^{20}}{{C}_{1}}{{\times }^{30}}{{C}_{1}}\] \[=20\times 30=600\]
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