1.

If ten times tenth term of an arithmetic sequence is equal to fifteen times fifteenth term, find 25th term. Calculate the product of first 25th terms.

Answer»

10 × (f + 9d) = 15 × ( f + 14 d) 

⇒ 10 f + 90 d = 15 f + 210 d 

⇒ 5 f + 120 d = 0 

⇒ f + 24 d = 0

25th term = f + 24 d = 0

25th term is 0. Product of 25 terms is 0.



Discussion

No Comment Found

Related InterviewSolutions