As, 1234 : 10
1 + 2 + 3 + 4 = 10
Similarly, 6789 : 30
6 + 7 + 8 + 9 = 30
All Except `Raft' are down by animal.
Only '729' is a perfect cube.
This is the only prime number in the group.
All others are soild metals.
Former is the food for latter.
As, 4 : 9 similarly 8 : 13
? ? = 13
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