(4) लाल और (3) नीली अलग-अलग गेंदों को एक पंक्ति में कितने तरीकों से रखा जा सकता है यदि सभी लाल गेंदें साथ रहें?
In how many ways can (4) distinct red balls and (3) distinct blue balls be arranged in a row if all red balls remain together?
Explanation opens after your attempt
A. (576)
Concept
Treat the four red balls as one block, then \(4!\cdot4!=576\). In exams, arrange the block and outside units separately.
Why this answer is correct
The correct answer is A. (576). Treat the four red balls as one block, then \(4!\cdot4!=576\). In exams, arrange the block and outside units separately.
Exam Tip
चार लाल गेंदों को एक ब्लॉक मानें, तब \(4!\cdot4!=576\)। परीक्षा में ब्लॉक और बाहरी इकाइयों को अलग-अलग व्यवस्थित करें।
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