Question

A library shelf contains seven novel and five biographies. in how many ways can a borrower choose three novels and two biographies?

Answer 1

Answer:

Explanation:

Hola !

If the borrower want to spend his half of time with novels and biographies .

Then he will choose half novels and biographies.

Thank you

# Astro

Answer 2

Answer:

Let the 5 novel be, N1,N2,N3,N4 & N5

And 4 biography be, B1,B2,B3,B4..

Now the 5 novel can be arranged in 5! and there is | N1 | N2 | N3 | N4 | N5 | 6 gaps in which we can place the biography book a/q to question .,this can be done in 6c4 × 4!

Now total no of ways = 5!×6c4 × 4!

I think u should understand….