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  • Question
  • What is th unit digit in ( 3 65+6 59+7 71 )?


  • Options
  • A. 6
  • B. 4
  • C. 2
  • D. 1

  • Correct Answer


  • Explanation

    Unit digit in 34 = 1
    ? Unit digit in ( 34 )16 = 1
    ? Unit digit in 365 = 3
    Unit digit in 659 = 6
    Unit digit in 771 = 3

    ? Required unit digit = Unit digit in ( 3 x 6 x 3 )
    = Unit digit in 54
    = 4


  • More questions

    • 1. 
      If U = {a, b, c, d, e, f}, A = {a, b, c}, B = {c, d, e, f}, C = {c, d, e}, find (A ? B) ? (A ? C).

    • Options
    • A. {c}
    • B. {a}
    • C. {b}
    • D. {d}
    • Discuss
    • 2. 
      If a and b are the roots of the equation x 2 - 6x + 6 = 0, find the value of 2(a 2 + b 2).

    • Options
    • A. 40
    • B. 42
    • C. 48
    • D. 46
    • Discuss
    • 3. 
      The simple interest on a certain sum of money for 3 yr at 8 % pa is half the compound interest on ? 8000 for 2 yr at 10 % pa. Find the sum on which simple interest is calculated

    • Options
    • A. ? 3500
    • B. ? 3800
    • C. ? 4000
    • D. ? 3600
    • Discuss
    • 4. 
      The value of k for which the roots ?, ? of the equation : x2 ? 6x + k = 0 satisfy the relation 3? + 2? = 20, is

    • Options
    • A. 8
    • B. - 8
    • C. 16
    • D. - 16
    • Discuss
    • 5. 
      What amount will be received on a sum of ? 1750 in 2 1/ 2 yr, if the interest is compounded at the rate of 8% pa?

    • Options
    • A. ? 2125
    • B. ? 2122.85
    • C. ? 2100
    • D. ? 2200
    • Discuss
    • 6. 
      Find what is that first years in which a sum of money will become more than double in amount if put out at compound interest at the rate of 10% per annum?

    • Options
    • A. 6th years
    • B. 7th years
    • C. 8th years
    • D. Data inadequate
    • Discuss
    • 7. 
      A sum of ? 8448 is to be divided between A and B who are respectively 18 and 19 yr old, in such a way that if their shares be invested at 6.25 % per annum at compound interest, they will receive equal amounts on attaining the age of 21 yr. The present share of A is

    • Options
    • A. ? 4225
    • B. ? 4352
    • C. ? 4096
    • D. ? 4000
    • Discuss
    • 8. 
      What is the difference between the compound interest and simple interest calculated on an amount of ? 16200 at the end of 3 yr at 25% pa? (Rounded off to two digits after decimal)

    • Options
    • A. ? 3213.44
    • B. ? 3302.42
    • C. ? 3495.28
    • D. ? 3290.63
    • Discuss
    • 9. How many times do the hands of a clock coincide in a day?

    • Options
    • A. 20
    • B. 21
    • C. 22
    • D. 24
    • Discuss
    • 10. 
      x = 3a solution of the equation 3x2 + (k ? 1)x + 9 = 0 if k has value

    • Options
    • A. 13
    • B. ?13
    • C. 11
    • D. ?11
    • Discuss


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