Others Maths Puzzle

Is the five digit number ABCDE divisible by 13?
I. The number DE is divisible by 13.
II. 10A + B + 4C + 3D - E is divisible by 13

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Others Other Question

If AB^2=CCDD and A,B,C,D can be same digits but minimum one is greater than 0
then A+B+C+D =? a/b, a+x/b+x, a+n/b+n.... n>x
can we find the relation between the three fractions, i mean which one is the greatest which one is the smallest???