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What do these two symbols in mathematics mean? High school?
As shown in the figure

As shown in the figure, sum the symbols and arrange the combined symbols respectively. The first is the summation symbol, which is expanded as follows:

Summation extension

Secondly, the symbols of permutation and combination are expanded as follows:

Arrangement calculation method

(2) The sum symbol is high school knowledge, and the permutation and combination is the probability part of high school.

References:

Sum symbol: Web link

Permutation and combination: network links