Question

if 8 times the eighth term of an A.P. is equal to 15 times of its fifteenth term, find the 23rd term of that A.P.​

Answer 1

Answer:

a23 = 0

Step-by-step explanation:

Let first term = a

Common difference = d

a23 = ??

a8 = a + 7d

a15 = a + 14d

==: 8 (a + 7d) = 15 (a + 14d)

==: 8a + 56d = 15a + 210d

==: 7a + 154d = 0

==: a + 22d = 0     ...............(1)

a23 = a + 22d

From 1

a23 = 0

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