18n + 10 S=1 Factor the difference an+l a, to show that the given sequence (a, } is strictly increasing or strictly decreasing. n 18n + 10 S n=1 an+1 - an = 10 strictly decreasing (18n + 10)(18n + 28)' 10 strictly decreasing (18n – 10)(18n – 28)' - 18 strictly increasing (18n + 10)(18n + 28)' 10 strictly increasing (18n + 10)(18n + 28)' 10 strictly increasing (18n – 10)(187 + 28)'

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