if F={x:x is a letter in the word apple},n(F)
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f={x:x is a letter in the word apple}
⇒f={a,p,l,e}
⇒n(f)=4
∵there a 4 elements in the set
⇒f={a,p,l,e}
⇒n(f)=4
∵there a 4 elements in the set
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