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A normal queue, if implemented using an array of size MAX_SIZE, gets full when

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1.
User perform following operations on stack of size 5 then -push(1);pop();push(2);push(3);pop();push(4);pop();pop();push(5);at the end of last operation, total number of elements present in the stack are -
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2.
In Computer generally _________ expressions are preferred.
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3.
The result of evaluating the postfix expression 5, 4, 6, +, *, 4, 9, 3, /, +, * is
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4.
Consider these functions:
push() : push an element into the stack

pop() : pop the top-of-the-stack element

top() : returns the item stored in top-of-the-stack-node

What will be the output after performing these sequence of operations

push(20);

push(4);

top();

pop();

pop();

pop();

push(5);

top();
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5.
Stack is useful for implementing
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