If 7 times of q is equal to p and 3 times of q is equal to r, then find the ratio of p ∶ q ∶ r.

1
7 ∶ 1 ∶ 3
2
1 ∶ 5 ∶ 7
3
1 ∶ 3 ∶ 7
4
7 ∶ 3 ∶ 1

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