Question

In a book stall, there are 4 copies of one book, 5 copies of another and single copy of 5 other difference books. Then the no. of ways that a person can purchase books is

• A. $340$
• B. $535$
• C. $959$
• D. $1002$

Answer 1

Answer: (C)

$959$

There a $4$ copies of $1$ book, $5$ copies of another book and a single copy of $5$ different books

Number of ways of selecting $4$ similar books $=5$

(either $0,1,2,3,4$ books)

Number of ways of selecting $5$ semilar ooks $=6$

$(0,1,2,3,4,5,6)$

Number of ways of velocity from $5$ different books

$=2^5=32wap$

$\therefore$ Total no fo ways $=5\times 6\times 32=960wap$

But this include a way where no book is purchased

$\therefore$ No. of ways $960-1=959$