If 'P' means '-', 'Q' means '+', 'R' means '÷' and 'S' means '×', then which of the following equation is incorrect?

1
8Q76R19P11 < 95R19Q27
2
88R11P4S2 > 9S2Q93
3
18Q45R36S72 > 95R19Q41
4
25Q75R25 < 33R31S62Q19

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