एक बैग में (5) अलग लाल और (7) अलग काली गेंदें हैं। (4) गेंदें चुननी हैं जिनमें रंग समान न हो। कितने चयन होंगे?
A bag has (5) distinct red and (7) distinct black balls. (4) balls are to be selected such that not all are of the same color. How many selections are possible?
Explanation opens after your attempt
C. (455)
Concept
Subtract all-red \(^{5}C_{4}=5\) and all-black \(^{7}C_{4}=35\) from total \(^{12}C_{4}=495\). Answer (455).
Why this answer is correct
The correct answer is C. (455). Subtract all-red \(^{5}C_{4}=5\) and all-black \(^{7}C_{4}=35\) from total \(^{12}C_{4}=495\). Answer (455).
Exam Tip
कुल \(^{12}C_{4}=495\) से सभी लाल \(^{5}C_{4}=5\) और सभी काली \(^{7}C_{4}=35\) हटाएं। उत्तर (455)।
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