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Q.

Given 8 different Physics books, 7 different Chemistry books and 5 different Mathematics books. How many ways are there to select one book?

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a

25

b

15

c

20

d

10

answer is A.

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Detailed Solution

Number of different physics books $= 8$

Number of different chemistry books $= 7$

Number of different mathematics books $= 5$

Number of ways of select a book $=^{20} C_{1}$

$= 20$

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