The series of natural numbers is divided into grounds as `(1), (2, 3, 4), (3, 4, 5, 6, 7), (4, 5, 6, 7, 8, 9, 10)���.` If sum of elements in the `20^(th)` ground is `l`, then `l` is equal to
The series of natural numbers is divided into grounds as `(1), (2, 3, 4),
The series of natural numbers is divided into grounds as `(1), (2, 3, 4), (3, 4, 5, 6, 7), (4, 5, 6, 7, 8, 9, 10)���.` If sum of elements in the `20^(th)` ground is `l`, then `l` is equal to
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