Q210 / 270 · NDA 2012 (Phase 1) · Mathematics

If $1 / 4,1 / x, 1 / 10$ are in HP, then what is the value of $x$ ?

  • A
    5
  • B
    6
  • Correct answer
    C
    7
  • D
    8

Solution

$4, x, 10$ are m AP. $\begin{aligned} & 2 x=4+10 \\ & x=\frac{14}{2}=7 \end{aligned}$

Hence, the correct answer is option: 'C'.

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