a+b=5 এবং a+b=3 হলে ab=?

১ হতে ৫০ পর্যন্ত বেজোড় সংখ্যাগুলোর গড় কত?

একটি বৃত্তের ব্যাসার্ধ যদি ২০% কমে, তবে উক্ত বৃত্তের ক্ষেত্রফল-

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