self Maths Puzzle

What is the sum of all five digit numbers formed by 2, 3, 4, 5, 6 without repetition?

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self Other Question

Find the sum of all the five digit numbers formed by the digits 2, 4, 6, 8, 0 when
(i) Repetition of the digits is not allowed
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?