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Que. Convert the following Infix expression to Postfix form using a stack
x + y * z + (p * q + r) * s, Follow usual precedence rule and assume that the expression is legal.
a. xyz*+pq*r+s*+
b. xyz*+pq*r+s+*
c. xyz+*pq*r+s*+
d. None of the mentioned
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