P is a permutation. It is asking for the numbers in the ()'s after it. For exapmle, P(6,4) is 6x5x4 which is 120.
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Lambda is usually specified to mean wavelength in mathematics and physics.
Yd is not a standrad mathematical symbol. Its meaning depends on the context.
A variable is a (letter) symbol that represents one or more numbers
The symbol is §
Answer: = The symbol for Similarity is the Tilde, ~. It is NOT the equal symbol, =.