(7) एक जैसी गेंदों को (4) अलग-अलग डिब्बों में इस प्रकार रखना है कि कोई डिब्बा खाली न रहे। कितने तरीके होंगे?
(7) identical balls are to be placed into (4) distinct boxes so that no box remains empty. How many ways are possible?
Explanation opens after your attempt
D. (20)
Concept
Place (1) ball in each box first. The remaining (3) balls can be distributed in \(^{6}C_{3}=20\) ways.
Why this answer is correct
The correct answer is D. (20). Place (1) ball in each box first. The remaining (3) balls can be distributed in \(^{6}C_{3}=20\) ways.
Exam Tip
हर डिब्बे में पहले (1) गेंद रखें। बची (3) गेंदों का वितरण \(^{6}C_{3}=20\) तरीकों से होगा।
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