The natural numbers are divided into groups as (1), (2, 3, 4), (5, 6, 7, 8, 9), &hellip; and so on. Then, the&nbsp;sum of the numbers in the 15th group is equal to&nbsp;

1 year ago

The natural numbers are divided into groups as (1), (2, 3, 4), (5, 6, 7, 8, 9), … and so on. Then, the sum of the numbers in the 15th group is equal to

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