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$P = \{2, 4, 6\}$ এবং $Q = \{3, 6, 7\}$ হলে P-Q নিচের কোনটি?

\{2, 3, 4, 6, 7\}

\{2, 3, 6, 7\}

\{2, 4, 6\}

\{2, 4\}

ANS : 4

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