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অফিসার (ক্যাশ ) - Sonali | Rupali | BD Krishi | Rajshahi Krishi Unnayn | Investment Corporation Of Bangladesh - ২৯. ০৩.২০১৯
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প্রিমিয়াম প্ল্যান: ১ মাস
99 ৳
৩০ দিনের জন্য সকল লাইভ এবং আর্কাইভ মডেল টেস্ট, প্রশ্ন ব্যাংক ও লেকচার শিট সহ অ্যাপ এর প্রিমিয়াম সব এক্সেস পাবেন।

242 . If A and B together can complete a work in 18 days, A and C together in 12 day and B and C together in 9 days, then B alone can do the work in -

  • A. 24 days
  • B. 18 days
  • C. 30days
  • D. 40 days
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অফিসার (ক্যাশ ) - Sonali | Rupali | BD Krishi | Rajshahi Krishi Unnayn | Investment Corporation Of Bangladesh - ২৯. ০৩.২০১৯
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246 . If a:b=1:3, b:c=5:7 then what is the value of a:b:c?

  • A. 3:5:7
  • B. 5:9:15
  • C. 5:15:21
  • D. 4:13:24
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247 . If a:b=4 and b:c=5 than a:b:c=?

  • A. 8: 15: 12
  • B. 20: 35: 42
  • C. 20: 35: 24
  • D. None
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বাংলাদেশ ব্যাংক || সহকারী পরিচালক 28-10-2022
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249 . If b + a = x and a - b = y, then a2 - b2 =

  • A. (x2 - y2)/2
  • B. (x2 - y)/2
  • C. 2xy
  • D. xy/2
  • E. xy
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251 . If both x and y are integers and x = 24y + 12, then which of the following must be true?

  • A. x/12 is even
  • B. x/6 is even
  • C. (x + 4)/8 is odd
  • D. (x + 4)/8 is even
  • E. None of these
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252 . If determinant of a matrix A is Zero than :

  • A. A is a Singular matrix
  • B. A is a non - Singular Matrix
  • C. First and last rows of the matrix must be same
  • D. First and last columns of the matrix must be same
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Senior Officer (IT) - Sonali-Janata-BD Krishi-BD Development Bank Ltd - 30.11.2018
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255 . If for a square matrix A , A2=A then such a matrix is known as :

  • A. Idempotent matrix
  • B. Orthagonal matrix
  • C. Null matrix
  • D. Identity matrix
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