If $P = {P : P i s l e t t e r o f t h e w o r d P E R M A N E N T}$ . Then n(P) ___.

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Solution

$P = {P : P i s l e t t e r i n t h e w o r d " P E R M A N E N T "} o r P = {p, e, r, m, a, n, t} ∴ n (P) = 7$

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