Question

7(7th term of ap)=11(11 th term of ap) then 18th term of ap is

Answer 1

hope you understood...!

Answer 2

Answer:

a + 6d = 11

a = 11 - 6d --- (i)

a + 10d = 18

a = 18 - 10d --- (ii)

Now we compare both equations:

Since we know that both the values stand for 'a', we can say that they are equal to each other.

11 - 6d = 18 - 10d

11 - 18 = -10d + 6d

-7 = -4d

7/4 = d

1.75 = d

Now we find the value of 'a' by substituting the value of 'd' in equation (i):

a = 11 - 6d

= 11 - 6(1.75)

= 11 - 10.5

= 1.5

First term of AP = 1.5

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