Infix to postfix stack size

Question

How is ans 15 for this question Please can anybody solve this 

Comments

For Correct Answer check here: https://gateoverflow.in/141728/infix-to-postfix-using-stack

Answer 1

The question asked is incomplete, they should ask "what is the sum of different height that stack should have while infix to postfix conversion."

The resultant postfix will be: - PQ+RS+*T/ABC+*+

and the different height will be ,2,3,4,5;

sum is 1 + 2 + 3 + 4 + 5 = 15.

Ans = 15

Comments

Yes that's what, so stack of size 5 should suffice right?

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Yes, because it will not reach up to more than 5.

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Thanks a lot everyone