Question

In maths in ap find the sum of 7times the 7th term is.Equall to 11times the 11th term find first 18 terms

Answer 1

Solution :

t7 = a+6d

t11 = a+10d

given ,

7(a+6d) = 11(a+10d)

7a + 42 d = 11a + 110 d

4a + 68d = 0

a + 17d = 0

t18 = a+17d = 0

so 18th term is 0

Hope that Helps !!!

Please Mark as Brainliest