Step: Expressing the set in roster form
In roster form, the elements of the set are written inside a pair of curly braces and are separated by commas.
Letters in the word 'CHITAMBARAM' are C, H, I, T, A, M, B, R.
[since elements in a set shouldn't repeated]
Thus, A = {C, H, I, T, A, M, B, R}
Hence, the roster form of set is A = {C, H, I, T, A, M, B, R}.