Question:P এবং Q যথাক্রমে 21 ও 35 এর সকল গুণনীয়কের সেট হলে `PuuQ` নির্ণয় কর। 

Answer 21 = `1 xx 21` = `3 xx 7` :. P = {1, 3, 7, 21} আবার, 35 = `1 xx 35` = `5 xx 7` :.Q = {1, 5, 7, 35} :.` PuuQ = {1, 3, 7, 21} uu {1, 5, 7, 35}` = {1, 3, 5, 7, 21, 35} 

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P abong Q jothacrme 21 o 35 ar shokl gunneyoker shet hole `PuuQ` nirony karo.
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