Answer:
She started with 200 stamps
Step-by-step explanation:
Yes
3:1 x 3 = 9:3
3:1 x 5 = 15:5
468
Formula for infinite sum of geometric series is;
S_∞ = a1/(1 - r)
Where;
a1 is first term
r is common ratio
We are given;
a1 = 156
r = ⅔
Thus;
S_∞ = 156/(1 - ⅔)
S_∞ = 156/(⅓)
S_∞ = 468
