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`first_three_multiples()`

### Instructions

**1.**

Write a function named `first_three_multiples()`

that has:

- An
`int`

parameter named`num`

.

The function should return an `std::vector`

of the first three multiples of `num`

in ascending order.

For example, `first_three_multiples(7)`

should return a vector with `7`

, `14`

, and `21`

.

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