Question

if 8 times of the 8th term of an ap is equal to 13 times of the 13th term .show that 21st term of an ap is 0​

Answer 1

Answer:

8 (a8) =13 (a13)

8 (a +7d) =13(a+ 12d)

Step-by-step explanation:

from above equipment find a and d

and put in this equal

a + 20d=0