# If $P=1;3;5;7.............21$ and $Q=2;4; 6;8; 10............22$ then HCF of $P$ and $Q$ is ________

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If $P=1;3;5;7.............21$ and $Q=2;4; 6;8; 10............22$ then HCF of $P$ and $Q$ is ________