Subject
Bank Exam
Topic
Islami Bank Bangladesh Ltd. PO 2017
What is the average (arithmetic mean) of all multiples of 10 from 10 to 400 inclusive?
What is the average (arithmetic mean) of all multiples of 10 from 10 to 400 inclusive?
ক)
190খ)
195গ)
200ঘ)
205ঙ)
210Explanation
Solution: প্রশ্নে বলা হচ্ছে যে, 10 ও 400 সহ 10 থেকে 400 পর্যন্ত 10 এর গুণিতক সংখ্যাগুলোর গড় কত ? এক্ষেত্রে 10 থেকে 400 পর্যন্ত সংখ্যাগুলোর ধারাটি হবে - 10 + 20 + 30 + 40 + ........ + 400 10 এর গুণিতক 10 থেকে 400 পর্যন্ত মোট 40 টি সংখ্যা রয়েছে । অতএব, ঐ 40 টি সংখ্যার সমষ্টি হবে = {2a + (n - 1)d } = { (2 10) + (40 - 1) 10 } [ ১ম পদ = a এবং সাধারণ অন্তর = d ] = 20 { 20 + (39 10) } = 20 410 = 8,200 ঐ 40 টি সংখ্যার গড় = = 205.Related questions
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