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Question

(1-1/3)(1-1/4)(1-1/5) ....... (1-1/x) = ?

  • 2x
  • 2x-1
  • 1/2x
  • 2/x
Answer- D

This type of question can solve by a short trick that is the first term numerator, and the last term denominator will be the answer.

i.e., 1-1/3 = 2/3, 1-1/4 = 3/4, 1-1/5 = 4/5 and so on

(2/3)*(3/4)*(4/5) .... ((x-1)/x) = (2) (1/x)

The first term denominator canceled by its next term numerator till the end.

In the end, we get 2/x.