72 ? 27 ? 99
After interchanging the signs,
72 + 27 - 99
Apply the BODMAS Rule.
= 99 - 99 = 0
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
Lotus grow on land.
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