JEE Main 2022 Mathematics question
The series of positive multiples of 3 is divided into sets: {3}, {6, 9, 12}, {15, 18, 21, 24, 27}, Then the sum of the elements in the set is equal to .
Answer: 6993
Solution
The sets contain 1, 3, 5, … elements, so the set has elements. The number of elements in the first 10 sets is 1 + 3 + … + 19
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