यदि (u=10q+7), तो \(u^2-u\) को 10 से भाग देने पर शेषफल क्या होगा?
If (u=10q+7), what is the remainder when \(u^2-u\) is divided by 10?
Explanation opens after your attempt
B. 2
Concept
The remainder of (u) is 7.
Why this answer is correct
The remainder of \(u^2-u\) comes from \(7^2-7=42\), and \(42=10\times4+2\).
Exam Tip
Substitute the remainder first, then find the final remainder. चरण 1: (u) का शेषफल 7 है। चरण 2: \(u^2-u\) का शेषफल \(7^2-7=42\) से मिलेगा, और \(42=10\times4+2\)। चरण 3: व्यंजक में पहले शेषफल रखें, फिर अंतिम शेषफल निकालें।
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