Question
Download Solution PDFনিম্নে প্রদত্ত প্রশ্নটি দুটি বিবৃতিকে অনুসরণ করছে
‘a’ কি ধনাত্মক?
I) a + b হল ধনাত্মক
II) a – b হল ধনাত্মক
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFI থেকে
আমরা জানতে পারি যে, a + b হল ধনাত্মক ⇏ a হল ধনাত্মক কারণ b একটি বড় ধনাত্মক মান হতে পারে যদি a হয় ঋণাত্মক।
II থেকে
আমরা জানতে পারি যে, a - b হল ধনাত্মক ⇏ a হল ধনাত্মক কারণ b একটি বড় ঋণাত্মক মান হতে পারে যদি a হয় ঋণাত্মক।
উভয়কে যুক্ত করলে যথা I + II
(a + b) + (a - b) = ধনাত্মক
a হল ধনাত্মক
উভয় বক্তব্যই যে ইতিবাচক/ধনাত্মক তা প্রমাণিত।
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