P= {a,b}, Q={b,c}, R={3,4} হলে (P∩Q)UR এর উপাদান সংখ্যা কত?
A 2
B 3
C 4
D 5
Correct Answer: Option B
({a,b}∩{b,c})U{3,4}
= {b }U{3,4}
={b,3,4}
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