2
4
5
6
Correct answer is A
3xC2=3x(3x−1)(3x−2)!(3x−2)!2!=15
3x(3x−1)=30⟹9x2−3x−30=0
9x2−18x+15x−30=9x(x−2)+15(x−2)=0
(9x+15)(x−2)=0
x = 2.
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