a+5d=9375....(1)
a+4d=375....(2)
find a&d wont be difficult now just subtract 1 from 2
t9=a+8d
If 6th term of a GP is 9375 and its 4th term is 375.find its 9th term?
2 answers
geometric, not arithmetic
A6 = ar^5 = 9375
A4 = ar^3 = 375
A6/A4 = r^2 = 9375/375 = 25
r = ±5
A9 = A6*r^3 = 9375 * ±125 = ±1171875
A6 = ar^5 = 9375
A4 = ar^3 = 375
A6/A4 = r^2 = 9375/375 = 25
r = ±5
A9 = A6*r^3 = 9375 * ±125 = ±1171875