Now we can see that if we added a 4th number we would have \(\frac{10 \cdot 9 \cdot 8 \cdot 7}{2 \cdot 3 \cdot 4} = \frac{5040}{24} = 210\).
ðððððððððððððððððððð ðððððððððððððððððððð ððððððððððð new OASIS - 21