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The laboratory tests on a soil sample yields the following results: natural moisture content $=18 \%$, liquid limit $=60 \%$, plastic limit $=25 \%$, percentage of clay sized fraction $=25\%$. The liquidity index and activity (as per the expression proposed by Skempton) of the soil, respectively, are

  1. $-0.2$ and $1.4$
  2. $0.2$ and $1.4$
  3. $-1.2$ and $0.714$
  4. $1.2$ and $0.714$
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