math

Consider the sets.
A = {distinct letters in the word keep}
B = {13}
C = {k, e, p}
D = {6 + 1}
E = {seven}
F = {7}

(a) What is the cardinality of each set?

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  1. I know the cardinality for b=1
    c=3
    d=1
    e=1
    f=1
    just don't know for letter A?
    also want to confirm that is right..

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