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Numbers grouped into sets or rows: sum of a group or row of a number

This type of question, asked 2 times: 26 Jul 2022, 8 Apr 2024. All 2 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    26 Jul 2022

    83
    The series of positive multiples of 3 is divided into sets: {3},{6,9,12},{15,18,21,24,27},…\mathbf{\{ 3\},\{ 6,9,12\},\{ 15,18,21,24,27\},\ldots} Then the sum of the elements in the 11th 11^{\text{th~}} set is equal to

  2. Question 2

    8 Apr 2024

    85
    Let the positive integers be written in the form: If the kth k^{\text{th~}} row contains exactly kk numbers for every natural number kk, then the row in which the number 5310 will be, is