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How would you write this and a explanation on how you got the answer?

I am not sure how to complete the challenge?

Hey, in swift you can use the 'modulo' or 'modulus' operator '%'. This returns a remainder.

In the example below, first it checks how many 'a' fit into 'b' and then returns the left over (not how many fit).

```let a = 2
let b = 7
let c = b % a
// c = 7 % 2
// 2 fits 3 times into 7, leaving a 1 remainder, so:
// c = 1
```

The result being, check if the remainder of 2 is 1 (therefore an odd number) and 7 is 0 (meaning the number is divisible by 7, leaving no remainder).

```var results: [Int] = []

for n in 1...100 {
if (n%2==1 && n%7==0) {
results.append(n)
}
}
```

Thanks for the help