DISCRETE MATHS

What is the cardinality of this set?

{p, {p}, {p, {p}}}

my answer is 1.
is it right?

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asked by Don
  1. no, the set has 3 elements.
    the first is p
    the 2nd is the set {p}
    the third is the set {p,{p}}

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    posted by Steve

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