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  • Question
  • What is the unit digit in the product (365 x 659 x 771)?


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

  • Correct Answer


  • Explanation
    Unit digit in 3 4 = 1 ⟹ Unit digit in (3 4 ) 16 = 1

    ∴ Unit digit in 365 = Unit digit in [ (34)16 x 3 ] = (1 x 3) = 3

    Unit digit in 659 = 6

    Unit digit in 74 ⟹ Unit digit in (74)17 is 1.

    Unit digit in 771 = Unit digit in [(74)17 x 73] = (1 x 3) = 3

    ∴ Required digit = Unit digit in (3 x 6 x 3) = 4.


  • Numbers problems


    Search Results


    • 1. Which one of the following can't be the square of natural number?

    • Options
    • A. 32761
    • B. 81225
    • C. 42437
    • D. 20164
    • E. None of these
    • Discuss
    • 2. The difference between the place value and the face value of 6 in the numeral 856973 is

    • Options
    • A. 973
    • B. 6973
    • C. 5994
    • D. None of these
    • Discuss
    • 3. The smallest 3 digit prime number is:

    • Options
    • A. 101
    • B. 103
    • C. 109
    • D. 113
    • Discuss
    • 4. If the number 653 xy is divisible by 90, then (x + y) =?

    • Options
    • A. 2
    • B. 3
    • C. 4
    • D. 6
    • Discuss
    • 5. The difference between the place values of two sevens in the numeral 69758472 is

    • Options
    • A. 0
    • B. 6993
    • C. 699930
    • D. None of these
    • Discuss
    • 6. How many 3 digit numbers are divisible by 6 in all?

    • Options
    • A. 149
    • B. 150
    • C. 151
    • D. 166
    • Discuss
    • 7. The smallest 6 digit number exactly divisible by 111 is:

    • Options
    • A. 111111
    • B. 110011
    • C. 100011
    • D. 110101
    • E. None of these
    • Discuss
    • 8. The largest 4 digit number exactly divisible by 88 is:

    • Options
    • A. 9944
    • B. 9768
    • C. 9988
    • D. 8888
    • E. None of these
    • Discuss
    • 9. Which one of the following is a prime number?

    • Options
    • A. 161
    • B. 221
    • C. 373
    • D. 437
    • E. None of these
    • Discuss
    • 10. In a division sum, the remainder is 0. As student mistook the divisor by 12 instead of 21 and obtained 35 as quotient. What is the correct quotient?

    • Options
    • A. 0
    • B. 12
    • C. 13
    • D. 20
    • Discuss


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