Subject
Bank Exam
Topic
Modhumoti Bank Ltd. - Probationary Officer - 2016
The seventh number in a sequence of numbers is 31 and each number after the first number in the sequence is 4 less than the number immediately preceding it. What is the fourth number in the sequence ?
The seventh number in a sequence of numbers is 31 and each number after the first number in the sequence is 4 less than the number immediately preceding it. What is the fourth number in the sequence ?
ক)
15খ)
19গ)
35ঘ)
43Explanation
Solution: প্রশ্নের শুরুতেই বলা হচ্ছে যে, একটি ক্রমধারা বা Sequence এর 7 th সংখ্যা 31 এবং Sequence টিতে প্রথম সংখ্যার পর প্রতিটি সংখ্যা পূর্ববর্তী সংখ্যার চেয়ে 4 কম । প্রশ্ন হলো Sequence টির 4 th সংখ্যা কত ? প্রশ্নমতে, Sequence টির 7 th সংখ্যা 31 এবং প্রথম সংখ্যার পর প্রতিটি সংখ্যা পূর্ববর্তী সংখ্যার চেয়ে 4 কম । 4 th সংখ্যাটি 7 th সংখ্যা থেকে বেশি ছিলো = 3 4 = 12 [ 7 - 4 = 3 ] 4 th সংখ্যাটি ছিলো = 31 + 12 = 43. Shortcut: 7 th সংখ্যা 6 th সংখ্যা 5 th সংখ্যা 4 th সংখ্যা 31 31 + 4 = 35 35 + 4 = 39 39 + 4 = 43Related questions
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