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
A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither 1 nor 2

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