Question

In how many ways can 4 light bulbs be selected from a batch of 43 lights bulbs to be tested for defects? Assume no light bulb will be tested more than once.

Answer 1

There are 123,410 ways

Explanation:

The number of ways or combinations in which we can select k elements from a group of n elements is given by:

`(n!)/(k!(n-k)!)`

In this case, we can replace n by 43 and k by 4, because we are going to select 4 light bulbs from a batch of 43 light bulbs.

So, the number of combinations is calculated as:

`(43!)/(4!(43-4)!)=123,140`

It means that there 123,410 ways to select 4 light bulbs from a batch of 43 lights bulbs to be tested for defects