6 + 9 + 12 + 15 + 18 + for math problems +303 6+9+12+15+18+…… +303

This is an arithmetic sequence with a tolerance of 3. You have to find out how many terms there are in this sequence
Not item = first item + (n-1) x tolerance (303-6) / 3 + 1 = n push out n = 100
Then the sum of the sequence is (6 + 303) X100 / 2 = 15450

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