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sequence and series (1 Viewer)

airie

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Uhh, did you write Tn=(53/3)*(-7/6)(n-1)? If it's an AP, it should've been a plus sign, instead of a multiplication sign.

Also, did the question specify that the sequence is an AP? It might have been a GP. Or maybe the textbook answer is for the sum of the first 4 terms. (I haven't done much calculation myself, only enough to say that I think your values for a and d, if it is indeed an AP, are right [oh and d=-7/6, I think you had a typo in there too] :p) Check?
 

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