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We don't need the number of those kind of nos in tthe first problem. And in the second problem, the numbers an also take on a negative value...
Q1. There are 7 digits. Pretend they are all different, a,b,c,d,e,f,g say.
For (1): Must all the digits be used in making one number?
(1) The sum of all no. that can be formed by using the digits
(2) Total no. of positive Integer solution of
(3) Total no. of positive Integer solution of