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

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

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