Answer :

90 is answer.1+2+3+4+5+6+7+8+9+0+9+8+7+6+5+4+3+2+1=90
1+2+3+4+5+6+7+8+9+0+9+8+7+6+5+4+3+2+1 = 90.
Therefore, the answer is 90.

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