Consider the following statements in respect of the expression S_n =(n(n+1))/2 where n is an integer. 1. Th

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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
A

Only 1

B

Only 2

C

Both 1 and 2

D

Neither 1 nor 2

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