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A person can invite at least 1 people among 6 people in these manners.

- At least 1 people are invited among 6 people. This can be done in
^{6}C_{1}ways

OR

2. 2 people can be invited among 6 people. This can be done in ^{6}C_{2} ways.

OR

3. 3 people can be invited among 6 people. This can be done in ^{6}C_{3} ways

OR

4. 4 people can be invited among 6 people. This can be done in ^{6}C_{4} ways.

OR

5. 5 people can be invited among 6 people. This can be done in ^{6}C_{5} ways.

OR

6. All the 6 people can be invited among 6 people. This can be done in ^{6}C_{6} ways.

**Total number of ways** = ^{6}C_{1 }+ ^{6}C_{2} +^{ 6}C_{3} + ^{6}C_{4} + ^{6}C_{5} + ^{6}C_{6} ways

= 6 + 15 + 20 + 15 + 6+ 1

= **63** ways.

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