four variables $a, b, c, d$ are given, what is the symmetric and cyclic sum?
I thought:
$$\sum_{cyc} ab = ab + ac + ad + bc + bd + cd$$
And
$$\sum_{sym} ab = 2(ab + ac + ad + bc + bd + cd)$$
Which one is correct?
2026-05-16 20:59:25.1778965165
Confused between cyclic sum and symmetric sums.
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