a1 = initial value
r = common ratio = 10
The n-th term of a geometric sequence:
an = a1 * r ^ ( n - 1 )
In this case:
a6 = a1 * r ^ 5
2,000 = a1 * 10 ^ 5
2,000 = 100,000 a1 Divide both sides by 100,000
2,000 / 100,000 = a1
0.02 = a1
a1 = 0.02
the 6 term of a G.P is 2000 its common ratio is 10 find the first term?
1 answer