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Yes.. I was dumbstruck for a moment when I saw this question in the test. But it can only be a(n-3).. So I went ahead and solved it that way..
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Two great challenges: 1. Guts to Fail and 2. Fear to Succeed

I have a curious question... quite honesly i did not understand what an= a_(n-3) +7 meant... i assumed something got cut off maybe it was a1*(n-3) + 7

i am used to seeing a(n) = a(n-3) +7 or watching the "n-3" similar to the "n" (as a footer) in the question in my quant thus far

so my questions are...

1. so do we get to see such a thing on the real test? i mean should i get used to this convention? and most importantly are there others?

2. if not, i would appreciate if the Veritas instructors have a look at this and help make the question more clearer

Thanks!

Yes, it is a typo. Subscripts and superscripts behave differently in different software and hence such errors creep up sometimes. You should not see such a thing in actual GMAT but if you do, think what it should be. Since you have subscripts on A everywhere, this logically seems like a subscript. Anyway, we know that '_' is not a mathematical symbol and in series questions, more often than not, subsequent terms are related to previous terms through some relation.
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Thanks Karishma.. yup.. i agree that some errors can creep in no matter what.... Murphy's law!!

was just curious if this denotes something i dont know... on recognizing this as a subscript.... well i went a step ahead to assume its a1 whose head was cut off from the base so i think too much thinking cost me this question