Hue is arranging chairs. She can form 5 rows of a given length with 2 chairs left over, or 9 rows of that
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Let's check the sets
- A={2,4,6,8,..}
- B={3,6,9..}
- C={7,14,21..}
Find LCM
- 2×3×7=42
- (AnBnC)={42}
Recreate the sets
- A={2,4,6,8,10,12..,42}
- B={3,6,9,..,42}
- C={7,14..42}
Now
- n(A)=21
- n(B)=14
- n(C)=6
Hence
Universal Set =U