6(a+5d) = 15(a+14d)
6a + 30d = 15a + 210d
9a = -180d
a = -20d
a + 20d = -20d + 20d = 0
if 6 times the sixth term is equal to 15 times the fifteenth term ,find its 21st term
4 answers
24
Very bad answers 😕 not satisfied
Yes. I agree with lakshmi