यदि \(U={1,2,\ldots,45}\), \(A={x:x\in U,9\mid x}\), तो (A') में (3) से विभाज्य सदस्यों की संख्या क्या है?
If \(U={1,2,\ldots,45}\), \(A={x:x\in U,9\mid x}\), how many elements divisible by (3) are in (A')?
Explanation opens after your attempt
A. (10)
Concept
There are (15) multiples of (3) up to (45). Among them (5) multiples of (9) are in (A), so (15-5=10) remain.
Why this answer is correct
The correct answer is A. (10). There are (15) multiples of (3) up to (45). Among them (5) multiples of (9) are in (A), so (15-5=10) remain.
Exam Tip
(45) तक (3) के (15) गुणज हैं। इनमें (9) के (5) गुणज (A) में हैं, इसलिए (15-5=10) बचते हैं।
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