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If (1+x+x^2)^10 =a0+a1 x+a2 x^2+.........

If `(1+x+x^2)^10 =a_0+a_1 x+a_2 x^2+..........+a_20 x^20` , then `(a_9 - 10C_1 *a_8+10C_2 * a_7-10 C_3 * a_6+.....+10C_9 * a_0)` is equal to

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