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.

There are 123,410 ways

Step-by-step explanation:

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

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:

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

correct answer:

i^31 = -i