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Let $f:[-1,2] \rightarrow[0, \infty]$ be a continuous function such that $f(x)=f(1-x) \forall x \in[-1,2]$.Let $R_1={ }^{\prime i n t} \_-1 \wedge 2 x f(x) d x^{\prime}$ and $R_2$ be the area of the region bounded by $y=f(x), x=-1, x=2$ and the $X$-axis. Then, .................

• A
  $R _1=2 R _2$
• ✓
  $2 R _1= R _2$
• C
  $3 R _1= R _2$
• D
  $R _1=3 R _2$