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Given that A is a...

Given that A is a four-digit number and that the sum of the digits of A is 16. Without further information about A, what can be said

about:

(a) the sum of the digits of A + 13?

(b) the sum of the digits of 13A?

about:

(a) the sum of the digits of A + 13?

(b) the sum of the digits of 13A?

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