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(a) worked out incorrectly; or (b) worked out correctly but using a method not specified in the problem statement; or (c) not4) Find the indicated term of the arithmetic sequence with the given description. (5 points each) a) The 3rd term is 15 and t

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93 IS A2i=87 9,=? IS ALENBIH) a + (n -Ild 15 a +(3-1)d + 2 d = 15 1) at (n-1) d = 87 a +(21-1)d = 87 at 20d 87-91) from i ata + (n-1)d = 7 + (n-1) 4 = 7 + 4 nr.4 un + 3 b) given common difference d= 7, find a20= -12 au = ? a +(n-1)d=-12. a +(20-1) (

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