Use the difference a+1 an to show that the given sequence {an} is strictly increasing or strictly decreasing. n 7n – 6 Sn=1 An+1 - an = 1 strictly decreasing (7п — 6)(7п + 6) strictly increasing (7п — 6)(7п + 1)" 6. strictly decreasing (7n + 6)(7n – 1)' strictly increasing (7п + 6)(7п — 1)" strictly decreasing (7n – 6)(7n + 1)'

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