Question

You are planning to email to two lists. the first list has 1,200 names. the second list has 900 names. there are 150 names that appear on both lists. how many total unique names do you have?

Answer 1

1,200 - 150 = 1,050
900 - 150 = 750
1,050 + 750 = 1,800

There are 1,800 total unique names.

Answer 2

Answer:  There are 1800 unique names from both the lists.

Explanation:

Since we have given that

there are two lists :

In First list, number of names = 1200

In Second list, number of names = 900

According to question , we have also given that

there are 150 names that appear on both lists,

So,

Number of unique names in the first list  is given by

$1200-150=1050$

Number of unique names in the second list is given by

$900-150=750$

Therefore, total number of unique names is given by

$1050+750=1800$

Hence, there are 1800 unique names from both the lists.