Mathematics, 12.08.2021 14:00 NetherisIsTheQueen

20 The nth term of an arithmetic series is Un where un > 0 for all n. The sum to n terms of the series is Sn
Given that u4 = 6 and that S11 = (u6)2 + 18
Find the value of u20

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20 The nth term of an arithmetic series is Un where un > 0 for all n. The sum to n terms of the...