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20-এর চেয়ে ছোট মৌলিক সংখ্যা কতগুলি রয়েছে?

A8
B6
C9
D7
Answer & Solution
Correct answer: A. 8
20-এর কম মৌলিক সংখ্যাগুলি হল 2, 3, 5, 7, 11, 13, 17 এবং 19, অর্থাৎ মোট আটটি।
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