S is the infinite sequence S1 = 2, S2 = 22, S3 = 222,...Sk = Sk-1 + 2(10k-1). If p is the sum of the first 30 terms of S, what is the eleventh digit of p, counting right to left from the units digit?
1 2 4 6 9
How do we solve this type of progression which seems to be of both types arithmetic and geometric
1 2 4 6 9
How do we solve this type of progression which seems to be of both types arithmetic and geometric
