Factor the difference an+1 – an to show that the given sequence {an} is strictly increasing or strictly decreasing. +00 12n +2J n=l An+1 - an = 2 strictly decreasing (12n – 2)(12n – 14)' 12 strictly increasing (12n + 2)(12n + 14) 2 ; strictly increasing (12n + 2)(12n + 14) 2 ; strictly decreasing (12n + 2)(12n + 14)' 2 strictly increasing (12n – 2)(12n + 14)

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