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AS: Relative percentage abundance...it is driving me crazy...and hazy...Help...

HELP.png I do not understand why y is being subtracted from 1.

I am confused on the entire question now...I am not even sure what formula is being used...
Please help me...Enlighten me...Save me...
Thank you in advance.
ok first y is the percentage abundance of the first isotope right?
and percentage abundance is usually out of 100% but as a decimal or a regular number 100% would b 1

so if the total is 1 and there are two abundances and one of them is y the the other is 1-y as the total 1 = y+ the other abundance

hope this clears is up its really hard to get your head around so read it slowly if you dont get it then tell me so I can try and put it in a simplier way

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