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In a sequence of numbers, a(1), a(2), a(3), ... , a(n), a(n+1), ...

he first differences are a(2) - a(1), a(3) - a(2), ... , a(n+1) - a(n) , ...

Alternatively, d the sequence of first differences is given by

d(n) = a(n+1) - a(n), n = 1, 2, 3, ...

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