একটি বড় বাক্সের মধ্যে ৪টি বাক্স আছে ও তার প্রত্যেকটির ভেতর ৪টি করে ছোট বাক্স আছে। মোট বাক্সের সংখ্যা কত?
A. ৩১টি
B. ২৩টি
C. ২১টি
D. ১৮টি
সঠিক উত্তরঃ
C.
২১টি
Explanation:
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