Find the sum to n terms …
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Posted by Abhinav S S 4 years, 11 months ago
- 1 answers
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Gaurav Seth 4 years, 11 months ago
As, it is given that k th term of the A.P. is 5k + 1.
therefore,
ak = a + (k – 1)d
⇒ a + (k – 1)d = 5k + 1
⇒ a + kd – d = 5k + 1
now, on comparing the coefficient of k, we get,
d = 5
and
a – d = 1
⇒ a – 5 = 1
⇒ a = 6
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