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Three four-digit numbers are written on cards. Cards are in position as is shown in the image. The sum of those three numbers is $10,126 .$ Which digits are covered?

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Let the covered numbers be 21x7 and yz26

Then from the picture, we have 1243+2107+10x+1000y+100z+26 = 10126

So 10x+1000y+100z=6750

Therefore, x=5, y=6, z=7

Covered digits are 5, 6, 7
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