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If  be the harmonic mean of a and b then value of n is:

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Official Sr. Teacher Gr II NON-TSP MATHEMATICS (Held on :29 Oct 2018)
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  1. 1
  2. -1
  3. 0
  4. 2

Answer (Detailed Solution Below)

Option 2 : -1
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Sr. Teacher Gr II NON-TSP GK Previous Year Official questions Quiz 4
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Detailed Solution

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Concept:

The harmonic mean between two numbers a and b is given by: 

HM = 

Calculation:

Given:   be the harmonic mean of a and b

To Find: n

As we know, 

The harmonic mean between two numbers a and b is given by: 

HM = 

This is possible only when n + 1 = 0

Therefore, n = -1

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