As, 41537 ? 4 + 1 + 5 + 3 + 7 = 20
? 2 + 0 = 2? (2)2 = 4
Similarly, 421? 4 + 2 + 1 = 7
? (7) 2 = 49
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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