Question

An ap is 4times the 8th term is equal to the 8 time s the 12th terms find t20

Answer 1

Solution:

We have been given a Expression which is given below.

☞ 4 ( T8 ) = 8 ( T12 )

Solve Expression:

☞ 4 ( a + 7d ) = 8 ( a + 11d )

☞ 4a + 28d = 8a + 88d

☞ 4a - 8a = 88d - 28d

☞ - 4a = 60d

☞ a = - 15d

Find the value of T20:

☞ T20 = a + 19d

☞ T20 = -15d + 19d

☞ T20 = 4d

Therefore, T20 is Equal to 4d.