Book Maths Puzzle

What is the sum of all 4 digit numbers formed using the digits 2, 3,4 and 5 without repetition?

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Book Other Question

In a birthday party, every person shakes hand with every other person. If there was a total of 28 handshakes in the party, how many persons were present in the party? Find the number of triangles that can be formed using 14 points in a plane such that 4 points are collinear?