How many different selections of 4 books can be made from 10 different books , if 2 particular books are never selected?

A 28
B 45
C 70
D 210

Correct Answer: 70

যাদেরকে অন্তর্ভুক্ত করা যাবে না। তাদেরকে প্রথম থেকেই বাদ দিতে হবে। এখন, 10টি ভিন্ন বই থেকে যেহেতু 2টি নির্দিষ্ট বইকে বাছাই করা হয়নি সেহেতু (10 - 2) = 8 টি হতে 4 টি বই বাছাই করার উপায় = 8C4 = 8.7.6.54.3.2.1 = 70
Bissoy MCQ
#গণিত #Combined Bank (সমন্বিত ব্যাংক) #সোনালী ও ডিবিবিএল ব্যাংক- সিনিয়র অফিসার (আইটি) - 16.10.2020

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