The original series is: 1, 2, 9, 28, 65, 126, ? We can see that the elements in the above series are in the following format: N 3 + 1, where N = position of the element in the series, starting from 0. Thus, the first element = 0 3 + 1 = 0 + 1 = 1. Second element = 1 3 + 1 = 1 + 1 = 2. Third element = 2 3 + 1 = 8 + 1 = 9. Fourth element = 3 3
Average =. Sum. Count. where the sum is the result of adding all of the given numbers, and the count is the number of values being added. For example, given the 5 numbers, 2, 7, 19, 24, and 25, the average can be calculated as such: Average =. 2 + 7 + 19 + 24 + 25. 5.
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2 9 28 65 next number