किस विकल्प में असमानता का चिन्ह गलत बदला गया है?
In which option has the inequality sign been changed incorrectly?
Explanation opens after your attempt
A. \(a<b\Rightarrow -2a<-2b\)
Concept
Multiplying by (-2) should reverse the sign, so the correct form is (-2a>-2b). This is the biggest error in negative multiplication.
Why this answer is correct
The correct answer is A. \(a<b\Rightarrow -2a<-2b\). Multiplying by (-2) should reverse the sign, so the correct form is (-2a>-2b). This is the biggest error in negative multiplication.
Exam Tip
(-2) से गुणा करने पर चिन्ह उलटना चाहिए, इसलिए सही रूप (-2a>-2b) है। ऋणात्मक गुणन में यही सबसे बड़ी गलती होती है।
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