A library has books of 5 different subjects. Assume that sufficient numbers of books in all subjects are available for selection and books of same subject are identical. The number of ways a student can select 7 books is: (Student can select any number of books of a subject)
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Given: A library has books of 5 different subjects.
sufficient numbers of books in all subjects are available for selection and books of same subject are identical.
Student can select any number of books of a subject
To Find : The number of ways a student can select 7 books
Solution:
5 Different subjects Selecting 7 books
n = 7
r = 5
formula is :
⁷⁺⁵⁻¹C₅₋₁
¹¹C₄
= 330
The number of ways a student can select 7 books is: 330
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