Question

The 8 th term is equal to the 12 th times of 12 th term.find 20 th term

Answer 1

Answer:

Let a be the first term and d be their common difference of the AP.

Then, nth term of the AP T

n

=a+(n−1)d

Given, 8×T

8 =12×T 12

=>8(a+(8−1)d)=12(a+(12−1)d)

=>8(a+7d)=12(a+11d)

=>2(a+7d)=3(a+11d)

=>2a+14d=3a+33d

=>a=−19d

So, T

20

=a+(20−1)d=−19d+19d=0

Answer 2

Step-by-step explanation:

$\rm {a\ =\ \omega^2R}$