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** Q 1628791601. ** Consider the following statements in respect of the expression `S_n =(n(n+1))/2`

where `n` is an integer.

1. There are exactly two values of `n` for which `S_n = 861`.

2. `S_n=S_(-(n+1))`, and hence for and integer `m`, we have

two values 'of `n` for which `S_n =m`

Which of the above statement(s) is/are correct `?`

**CDS 2016 **