Can you Identify?

Calculus Level 4

\[ \sum_{n = 1}^{49} \frac{1}{\sqrt{n + \sqrt{(n - 1)(n + 1)}}} = a + b\sqrt{c}\]

\(a, b, c \) are positive integers, and \(c\) is not divisible by the square of any prime.

find \(\Big[\frac{a+ b + c}{-2.123456789}\Big]\)

[.] denotes greatest integer function

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