यदि \(A={x\in \mathbb{N}:x\) (5) से विभाज्य है और \(x\leq 100}\) है, तो (n(A)) कितना है?
If \(A={x\in \mathbb{N}:x\) is divisible by (5) and \(x\leq 100}\), what is (n(A))?
Explanation opens after your attempt
A. (20)
Concept
The multiples of (5) from (5) to (100) are \(5,10,\ldots,100\).
Why this answer is correct
Their count is \(100\div5=20\).
Exam Tip
If the upper bound is a multiple, include it in the count. चरण 1: (5) से (100) तक (5) के गुणज \(5,10,\ldots,100\) हैं। चरण 2: इनकी संख्या \(100\div5=20\) है। चरण 3: यदि ऊपरी सीमा गुणज है तो उसे गिनती में शामिल करें।
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