Number System MCQs with Answers Exercise III


Ques 1 Number System

Find the number of trailing zero in 149!.?
  a) 20
  b) 24
  c) 35
  d) 41


c is the correct option
By using the above formula..

no of trailing zero=(n⁄5)+(n⁄25)+(n⁄125)+(n⁄625)+.......................

no of trailing zero in 149!=(149⁄5)+(149⁄25)+(149⁄125)+(149⁄625)

no of trailing zero in 149!=29+5+1+0
no of trailing zero in 149!=35




Ques 2 Number System

Two numbers differ by 5. If their product is 336, the sum of the two numbers is.
  a) 25
  b) 28
  c) 30
  d) 37


d is the correct option




Ques 3 Number System

The unit digit in the product (124)372 + (124373 is.
  a) 0
  b) 4
  c) 9
  d) 2


a is the correct option




Ques 4 Number System

The unit digit in the product (124)372 + (124373 is.
  a) 0
  b) 4
  c) 9
  d) 2


a is the correct option




Ques 5 Number System

What is the unit digit of 1! + 2! + 3! + ……+99!.?
  a) 2
  b) 3
  c) 6
  d) 8


b is the correct option