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Question

The number of real numbers out of 3,4.353536,2, 5.¯¯¯¯¯¯¯¯¯¯¯¯¯¯22222,2.12, 3i,2.152653... is
  1. 3
  2. 4
  3. 5
  4. 6


Solution

The correct option is C 5
3 is integer and hence it is real number.
4.353536 is rational and hence it is real number.
2=2i is complex number, hence it is not real number.
5.¯¯¯¯¯¯¯¯¯¯¯¯¯¯22222 is rational number and hence it is real number.
2.12 rational and hence it is real number.
3i is complex number hence it is not real number.
2.152653... is irrational and hence it is real number.
 

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