Consider a series of numbers, S_1, S_2, S_3, ..., defined...

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sub-505

Sequences

Consider a series of numbers,

S_1

S_2

S_3

, ..., defined by the formula

S_k = k^2 - k

for every positive integer k. If

S_n

equals 72, what is the value of

S_{n - 1}

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SohiniAug 13, 2024

thanks

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sub-505

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