ધારો કે $f:[-1, 2] \rightarrow [0, \infty)$ એક સતત વિધેય છે જેથી દરેક $x \in [-1, 2]$ માટે $f(x) = f(1-x)$ થાય. જો $R_1 = \int_{-1}^2 x f(x) dx$ હોય અને $R_2$ એ $y = f(x)$,$x = -1$,$x = 2$ અને $X$-અક્ષ દ્વારા આવૃત પ્રદેશનું ક્ષેત્રફળ હોય,તો $R_2$ શું છે?

  • A
    $\frac{1}{2} R_1$
  • B
    $2 R_1$
  • C
    $3 R_1$
  • D
    $\frac{1}{3} R_1$

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