নিচের কোন সংখ্যাটি মৌলিক?
ক) 91
খ) 143
গ) 47
ঘ) 87
বিস্তারিত ব্যাখ্যা:
মৌলিক সংখ্যা হলো সেই সংখ্যা যা ১ এবং ঐ সংখ্যা ছাড়া অন্য কোনো সংখ্যা দ্বারা নিঃশেষে বিভাজ্য নয়। এখানে, ৯১ = ৭×১৩; ১৪৩ = ১১×১৩; ৮৭ = ৩×২৯। শুধুমাত্র ৪৭ সংখ্যাটি ১ ও ৪৭ ছাড়া অন্য কোনো সংখ্যা দ্বারা বিভাজ্য নয়। তাই ৪৭ একটি মৌলিক সংখ্যা।
Related Questions
ক) buck
খ) bitch
গ) groom
ঘ) actor
Note : 'Bitch' is the feminine gender for a dog. The other options are masculine: 'Buck' (male deer/rabbit), 'Groom' (a man about to be married), and 'Actor' (masculine form of actress).
ক) Your mistake hold this view
খ) You mistake in holding this view
গ) You are mistaken in holding this view
ঘ) You are mistaken to hold this view
Note : The correct expression is 'to be mistaken in (doing) something'. It means to have a wrong opinion or idea. Therefore, 'You are mistaken in holding this view' is the grammatically correct and idiomatic sentence.
ক) Cancel
খ) Perform
গ) Create
ঘ) Generate
Note : 'Abolish' means to formally put an end to a system, practice, or institution. 'Cancel' has a similar meaning of nullifying or making something void. Therefore, 'Cancel' is the closest synonym.
ক) On
খ) Over
গ) For
ঘ) Above
Note : 'Over' is used to describe something that is at a higher level than something else, often covering or crossing it without touching. A bridge goes from one side of a river to the other, so 'over' is the correct preposition. 'On' would imply the bridge is floating on the water.
ক) of
খ) from
গ) at
ঘ) for
Note : The preposition 'for' is used to indicate a cause or a reason, especially a noble one like dying for one's country, a belief, or a cause. It signifies sacrifice.
ক) too follish to
খ) too intelligent to
গ) too rash to
ঘ) too wise to
Note : The structure 'too + adjective + to + verb' implies a negative result. The sentence means the person was so intelligent that they should not have made a silly mistake. 'Too intelligent to make a mistake' fits logically. The original key 'B' seems counterintuitive but implies irony or an unexpected outcome.
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