7. An oblong number counts the number of dots in a rectangular array having one more row than it has columns; the rst few of these numbers are 01 = 2 02 = 6 03 = 12 04 = 20 and in general, the nth oblong number is given by O, = n(n + 1). Prove algebraically and geometrically that (c) On +n? = t2n-

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