Question

If 9 time the 9th term is equal to 13 times the 13th term then find 22nd term

Answer 1

9(a+(n-1) d) =13(a+(n-1) d)
4a+4(n-1) d=0
a+(n-1) d=0
a=(1-n) d
22th term=a+(n-1ld
=d-nd+nd-d
=0

Answer 2

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