Question

The number of ways in which one can post 5 letters in 7 letter boxes

Answer 1

Answer:

ye sawal bio ka toh nhi hai

Phir bhi 7C5

Answer 2

The required number of ways = 21.

Explanation:

Given,

Total number of  boxes = 7 and

one can post 5 letters

To find, the number of ways = ?

∴ The number of ways = $^{7} C_5$

$=\dfrac{7!}{5!(7-5)!}$

$=\dfrac{6\times 7 \times 5!}{5!(2)!}$

$=\dfrac{42}{2}$

= 21

Hence, the required number of ways = 21.