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Numer Theory

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How many copies of n+1 are in there in the second line?
with n=6 and n=7

  • Number Theory -

    Since the n numbers are divided up in pairs, I'd say n/2 copies.

    Hence the formula for the sum: n(n+1)/2

    Technically, that's [n+1]/2 where [] is the greatest-integer function.

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