यदि (n=22q+21), तो \(n^2+2n+1\) को 22 से भाग देने पर शेषफल क्या होगा?
If (n=22q+21), what is the remainder when \(n^2+2n+1\) is divided by 22?
Explanation opens after your attempt
A. 0
Concept
(n-2+2n+1=(n+1)2).
Why this answer is correct
Since the remainder of (n) is 21, the remainder of (n+1) is 0.
Exam Tip
When (n+1) is divisible by 22, its square is also divisible by 22. चरण 1: (n-2+2n+1=(n+1)2) है। चरण 2: (n) का शेषफल 21 है, इसलिए (n+1) का शेषफल 0 होगा। चरण 3: जब (n+1) 22 से विभाज्य है, तो उसका वर्ग भी 22 से विभाज्य होगा।
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