Question

Write and simplify an expression to represent the sum of three consecutive odd integers.

Answer 1

sum = n + n+2 + n+4 = 3 n + 6

test run
if n = 3
3*3+6 = 9 + 6 = 15
so does 3 + 5 + 7 = 15 ?
Of course the same expression will work for three consecutive even numbers :)