allerya : b = c : d একটি সমানুপাতে, প্রান্তীয় রাশিগুলির গুণফল সমান হয় এদের গুণফলের:
Ab এবং c
Ba এবং d
Ca এবং b
Dc এবং d
Answer & Solution
Correct answer: A. b এবং c
সমান অনুপাত থেকে পাই a/b = c/d, সুতরাং a x d = b x c, অর্থাৎ প্রান্তীয় পদগুলির গুণফল মধ্যম পদ b এবং c-এর গুণফলের সমান।
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