Attempt the question, check the explanation, and continue with similar questions to build confidence before exams.
10-12 सेंटीमीटर
20-22 सेंटीमीटर
24-25 सेंटीमीटर
30-32 सेंटीमीटर
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Continue with nearby questions to strengthen the same chapter concept while you still have the context fresh in mind.