Subject
Bank Exam
Topic
UCBL Bank Ltd. - Management Trainee Officer - 2017
If n is even, Which of the following cannot be odd ?
If n is even, Which of the following cannot be odd ?
ক)
n+3খ)
3n+1গ)
n2- 1ঘ)
2(n+3)ঙ)
NoneExplanation
প্রশ্নে বলা হচ্ছে যে, n হচ্ছে জোড় সংখ্যা, তাহলে নিচের কোনটি বিজোড় হতে পারে না ? অর্থাৎ অবশ্যই জোড় হবে । ধরি, n = 2 তাহলে অপশন a) তে আছে, n + 3 = 2 + 3 = 5, তাই এটি বাদ । অপশন b) তে আছে, 3n + 1 = 6 + 1 = 7, তাই এটিও বাদ । অপশন c) তে আছে, n 2 - 1 = 2 2 - 1 = 4 - 1 = 3, তাই এটিও বাদ । এবং অপশন d) তে আছে, 2(n+3) = 2(2+3) = 2 5 = 10. তাই এটি জোড় বলে এটিই উত্তর হবে । Shortcut: এ ধরনের অঙ্কে জোড় সংখ্যা = 0 ধরলে নিচের মতো খুব দ্রুত কর যায় । a) n+3 = 0+3 = 3 b) 3n + 1 = 1 c) n 2 - 1 = -1 d) 2(n + 3) = 6 = জোড়Related questions
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