Yes Because ∑ is a summation symbol, it is mainly used to find the sum of multiple terms, so it is often used in mathematics knowledge of arts and sciences in senior high schools. The commonly used formulas are ∑Cn=∑Bn+∑An, and the summation formula is an indispensable part of the college entrance examination mathematics, which leads to ∑ reviewing the knowledge points of liberal arts in senior high school.