Factor the difference an+1 an to show that the given sequence {an} is strictly increasing or strictly decreasing. п 15n + 10 J n=1 An+1 - an = 10 ; strictly increasing (15n – 10)(15n + 25) 10 strictly decreasing (15n — 10)(15п -25) 10 strictly decreasing (15n + 10)(15n + 25)' 10 ; strictly increasing (15n + 10)(15n + 25)' 15 ;strictly increasing (15n + 10)(15n + 25)'

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