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if we remove those 4 cards then we have the cards from 2,3,4,5,6,7,8,9,10

use arithmetic progression with first and last elements i.e a,l

sum of all digits =n/2(a+l);

n=9

a=2

l=10

sum=9/2(2+10)

=9/2(12)

=54

but 4 times = 4*54=216

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13y ago

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