Question

If 7 times of the 7th term of AP is equal to 11 times its 11th terms ​then find the 18th term

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

We know that

an = a + (n-1)d

Given that

7 times the 7th term is equal to 11 times its 11th term

7x a, = 11 x a,1

7x (a + (7-1)d) = 11 x (a + (11 - 1)d)

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

7a + 42d = 11a + 110d

7a - 1la = 110d - 42d

-4a = 68d

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