Question

Consider the sets.
A = {distinct letters in the word pipe}
B = {13}
C = {p, i, e}
D = {2 + 1}
E = {three}
F = {3}

(a) What is the cardinality of each set?
|A| =
|B| =
|C| =
|D| =
|E| =
|F| =