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p(x)=3x2-2mx+2n
now 2 and -3 are zreos of p(x)
so
p(2)=0
Or, 12-4m+2n=0..........................1
p(-3)=0
Or, 27-6m+2n=0.......................2
comparing both eq.
2m=15
so m=15/2
similarly
n=27/4