Question

if 8 times the 8th term of an ap is equal to seven times its seventh term what is the 15th term

Answer 1

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Answer 2

Solution:

We have been given a Expression which is given below.

☞ 8 ( T8 ) = 7 ( T7)

Solve Expression:

☞ 8 ( a + 7d ) = 7 ( a + 6d )

☞ 8a + 56d = 7a + 42d

☞ 8a - 7a = 42d - 56d

☞ a = -14d

Find the value of T15:

☞ T15 = a + 14d

☞ T15= -14d + 19d

☞ T15= 0

Therefore, T15 is Equal to 0.