જો $I=\int_1^3 \sqrt{3+x+x^2} dx$ હોય,તો $I$ કયા અંતરાલમાં આવે છે?

  • A
    $(2 \sqrt{5}, 2 \sqrt{15})$
  • B
    $(\sqrt{3}, 2 \sqrt{5})$
  • C
    $(\sqrt{23}, \sqrt{33})$
  • D
    $(2 \sqrt{15}, \sqrt{23})$

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