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  1. If p, q, r, s are in harmonic progression and p > s, then —
    1. 1
      		<
      1
      psqr
    2. q + r = p + s
    3. 1
      		+
      1
      		=
      1
      		+
      1
      qprs
    4. None of these
Correct Option: D

According to question,
If p, q, r, s are in HP.

⇒
1
 ,
1
 ,
1
 ,
1
 are in AP.
pqrs

⇒
1
 -
1
 =
1
 -
1
qpsr

⇒
1
 +
1
 =
1
 +
1
qrsp

Hence, the none of these be answer


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