The result of evaluating the postfix expression 5 4 6 + * 4 9 3 / + * is?ans.

To evaluate the postfix expression, we use a stack to hold operands and then perform operations. Here are the steps:

1. Push 5 onto the stack.
2. Push 4 onto the stack.
3. Push 6 onto the stack.
4. Pop 6 and 4, add them to get 10, and push the result back onto the stack. Now the stack is [5, 10].
5. Pop 10 and 5, multiply them to get 50, and push the result back onto the stack. Now the stack is [50].
6. Push 4 onto the stack.
7. Push 9 onto the stack.
8. Push 3 onto the stack.
9. Pop 3 and 9, divide 9 by 3 to get 3, and push the result back onto the stack. Now the stack is [50, 4, 3].
10. Pop 3 and 4, add them to get 7, and push the result back onto the stack. Now the stack is [50, 7].
11. Pop 7 and 50, multiply them to get 350.

So, the result of evaluating the postfix expression 5 4 6 + * 4 9 3 / + * is 350.