A) 7
B) 5
C) 10
D) 4
Correct Answer: B
Solution :
[b]C stands for set of students taking economics \[a+b+c+d+e+f+g=40;a+b+d+g=16\] \[b+c+e+g=22;\,\,d+e+f+g=26\] \[b+g=5;e+g=14;g=2\] Go by backward substitution \[e=12,b=3,d+f=12,c+e=17\Rightarrow c=5;a+d=11\]\[a+d+f=18\Rightarrow f=7\,\,\,\therefore d=12-7=5\]You need to login to perform this action.
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