Question

How many ways can choose 7 friends to be invited to the party out of 20 total friends?

Answer 1

Answer:

Each of the 7 friends could be present or not present (2 cases) at the party giving total of  27  scenarios.

Since at least one must be present we exclude the case that none of them is present. So the answer would be:

27−1=127.

Step-by-step explanation:

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