There are exactly two values of n for which Sn = 861

Consider the following statements in respect of the expression
Sn = n (n + a)/2
where n is an integer:
1. There are exactly two values of n for which Sn = 861
2. Sn = S-(n + 1) and hence for nay integer m, we have two values of n for which Sn = 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

Anurag Mishra Professor Asked on 19th February 2016 in Maths.
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  • 1 Answer(s)

    Answer: (b) 2 only

    Anurag Mishra Professor Answered on 20th February 2016.
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