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GATE2019: 13

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Which of the following are geometric series?

  1. $1,\:6,\:11,\:16,\:21,\:26,\:\dots$
  2. $9,\:6,\:3,\:0,\:-3,\:-6,\:\dots$
  3. $1,\:3,\:9,\:27,\:81,\:\dots$
  4. $4,\:-8,\:16,\:-32,\:64,\:\dots$
  1. $P$ and $Q$ only
  2. $R$ and $S$ only
  3. $Q$ and $S$ only
  4. $P, Q$ and $R$ only
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