Subject
Bank Exam
Topic
Dutch-Bangla Bank Ltd. - Assistant Officer - 2017
If the average (arithmetic mean) of sever consecutive integers is k + 2, then the product of the greatest and least integer is
If the average (arithmetic mean) of sever consecutive integers is k + 2, then the product of the greatest and least integer is
ক)
k2+ 4k - 5খ)
k2- 9গ)
k2+ 6k + 9ঘ)
k2- 2k + 1ঙ)
None of theseExplanation
Solution: প্রশ্নে বলা হচ্ছে যে, 7টি ধারাবাহিক সংখ্যার গড় হচ্ছে k+2. বৃহত্তম ও ক্ষুদ্রতম সংখ্যা দুটির গুণফল কত হবে ? মনেকরি, প্রথম সংখ্যাটি x তাহলে প্রশ্নমতে, => 7x + 21 = 2k + 14 => 7x = 7k - 7 => x = (k - 1) x + 6 = k - 1 + 6 = k + 5 বৃহতম ও ক্ষুদ্রতম সংখ্যা দুটির গুণফল হবে = (k - 1) (k + 5) = k 2 + 5k - k - 5 = k 2 + 4k - 5Related questions
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