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A number, t, is a triangular number if (1 + 8t) is a square of an odd number.
multiply by some number, whatever number you wand\t or need.
Count the number of elements in the set - call this number n. Add up all the numbers in the set - call this total t Then mean = t/n
The lower bound of a set S if a number L such that L < s for all s in S and, given another number d (however small), there is an element t, in S such that t < L+d.
t-j. Happy Christmas!