Club A has 20 members and Club B has 27. If a total of 42 people belong to the two clubs, how many people belong to both clubs?

A 3

B 4

C 5

D 6

Solution

Correct Answer: Option C

এক্ষেত্রে প্রয়োজনীয় সূত্রটি হলোঃ
Total = n(A) + n(B) - Both
42=20+27- Both
Both= 47-42+5
উভয় ক্লাবেই আছে এমন সদস্য সংখ্যা ৫ জন। 

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