Let S and be two semaphores initialized to 1 Po wait (S); wait (Q) ; signal (S); signal (Q); P₁ wait (Q) ; wait (S); signal (Q); signal (S); (a) Explain why this happens, i.e. PO waiting for P1 to release something, while P1 waiting for PO to release another thing. (b) Can this be fixed by changing the order of some instructions of P1? Explain!

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Use of XOR function

XOR function or exclusive OR function was introduced in Excel 2013. This function is available under excel logical functions. For the given statement, the XOR function will return true only when either of the statements is true. It returns false when both the statements are true or when both the statements are false.