self Maths Puzzle

How many numbers greater than a billion but less than 1010 can be formed such that the sum of the digits is equal to 3?

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self Other Question

I forgot my friend’s 7 digit telephone number, but I remembered that the first two digits of the number are either 25 or 53. Also the number is even and the digit 2 appears once. What is the maximum number of trials I have to make before I can contact my friend? How many six digit numbers are possible by using the digits 1, 2 , 3, 4, 5, 6, 7 without repetition such that they are divisible by 12?