6. The number of way a person roundtrip by bus from A to C by way of B will be

- Option : C
- Explanation : There are twelve ways to go from A to C by way of B, and 12 ways to return. Hence there are 12 x 12 = 144 ways to travel round trip.

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7. The number of diagonals that can be drawn by joining the vertices of an octagon is

- Option : C
- Explanation :

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9. How many 10 digits numbers can be written by using the digits 1 and 2 ?

- Option : B
- Explanation :

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- Option : D
- Explanation :

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