Subject
Bank Exam
Topic
Modhumoti Bank Ltd. - Probationary Officer - 2018
There are 10 books on a shelf, of which 4 are paperbacks and 6 are hardbacks. How many possible selections of 5 books from the shelf contain at least one paperback and at least one hardback ?
There are 10 books on a shelf, of which 4 are paperbacks and 6 are hardbacks. How many possible selections of 5 books from the shelf contain at least one paperback and at least one hardback ?
ক)
75খ)
120গ)
210ঘ)
246Explanation
Solution: প্রশ্নে বলা হচ্ছে, একটি বুক শেলফে 10টি বই রয়েছে, যাদের মধ্যে 4টি Paperback এবং 6টি Hardback. এদের মধ্যে থেকে 5টি বই কত প্রকারে বাছাই করা যাবে যেখানে কমপক্ষে 1টি Paperback এবং 1টি Hardback বই থাকবে ? 10 টি বই হতে 5 টি বই বেছে নেয়ার উপায় যেখানে সর্বদা কমপক্ষে একটি Paperback ও একটি Hardback বই থাকবে- Paperback (4) Hardback (6) বাছাই সংখ্যা 1 4 4c 1 6c 4 = 4 15 = 60 2 3 4c 2 6c 3 = 6 20 = 120 3 2 4c 3 6c 2 = 4 15 = 60 4 1 4c 4 6c 1 = 1 6 = 6 মোট উপায় = 246Related questions
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