Sequences and Series**

15) Given that a sequence is arithmetic, a 1 = 5, and the common difference is 4, find a 37. 16) Given that a sequence is arithmetic , a 52 = 161, and the common difference is 3, find a 1 . 17) Given that a sequence is geometric , the first term is 1536, and the common ratio is ½ , … ................
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