Consider the following statements in res...

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 any integer m, we have two values of n for which `S_(n) = m`.
Which of the above statements is/are correct?

A

1 only

B

2 only

C

Both 1 and 2

D

Neither 1 nor 2

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