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N, the set of natural numbers, is partitioned into subsets S1 ={1},S2 ={2,3},S3 ={4,5,6},S4 ={7,8,9,10}. The last term of these groups is 1,1+2,1+2+3,1+2+3+4, so on. Find the sum of the elements in the subset S50 . |
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Answer» a. `S_12` |
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