২৫ থেকে ৫৫ এর মধ্যে মৌলিক সংখ্যা কয়টি?
A. ৪টি
B. ৬টি
C. ৭টি
D. ৯টি
সঠিক উত্তরঃ
C.
৭টি
Explanation:
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