Not sure what PEMBAS is. It does not include D nd so division is clearly not part of whatever rule you are referring to.
50*1 - 60 - 60*0 + 10 = 50 - 60 - 0 + 10 = 0
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There's a rule?
24 PS I RULE!
No. You may be thinking of the rule that a minus times a minus gives a plus. So -1 x -1 = +1. Or you may be thinking of using two plus signs. E.g. 1 + + 1 This just means 1 plus the positive version of one. This is just one plus one.
To find the nth number that is generated by the rule multiply n by 4 and then add 2.
51