BPSC – Combined Competitive Examination · প্রশ্ন 84
In a class of 55 students, 34 like cricket and 26 like badminton; every student likes at least one. How many like both?
উত্তর দেখান ও ব্যাখ্যা
উত্তর: (B) 5
ব্যাখ্যা
n(A ∩ B) = n(A) + n(B) − n(A ∪ B) = 34 + 26 − 55 = 5.
- (A) ভুল
Wrong: 34 + 26 − 55 = 5.
- (B) সঠিক
Correct: both = 34 + 26 − 55 = 5.
- (C) ভুল
Wrong: 34 + 26 − 55 = 5.
- (D) ভুল
Wrong: 34 + 26 − 55 = 5.
- (E) ভুল
Wrong: only one of the options A–D is correct.