यदि (7) candidates में से (3) posts अलग-अलग हैं तो choose-and-arrange expression कौन-सा है?
If there are (3) different posts among (7) candidates, what is the choose-and-arrange expression?
Explanation opens after your attempt
B. \(^{7}C_3\times3!\)
Concept
First choose (3) candidates and then assign the posts in (3!) ways. In exams add arrangement when posts are different.
Why this answer is correct
The correct answer is B. \(^{7}C_3\times3!\). First choose (3) candidates and then assign the posts in (3!) ways. In exams add arrangement when posts are different.
Exam Tip
पहले (3) candidates चुनें और फिर उन्हें (3!) ways से posts दें। परीक्षा में अलग posts हों तो arrangement जोड़ें।
Login to save your score, XP, coins and progress.
