1.6. There are 4 different books of Statistics and 3 different books of Economics on a table. In how
many ways can 2 books be selected such that
(1) both the books are of the same subject ?
(2) both the books are of different subject ?
(3) no book of Economics is selected ?
Answers
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Step-by-step explanation:
For 1:
We have 6 books of Economics, 3 of Mathematics and 2 of Accountancy
Arranging the books within the branches:
Economics - 6!
Maths - 3!
Accountancy - 2!
Thus the arranging branches are 3!
Thus, total arrangement
6!×3!×2!×3!=32,400
For 2: We have to add all the books together then arrange it
6+3+2=11
Thus the total arrangement are:
11!
39,916,800
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