Directions: The amount of work done by a man on nth day after starting the work is n times to that can be done on first day. If 8 men started the work, it can be completed in 10 days.
If only one man started the work, how many days at least it required to complete the work?
Let f(n) denote the square of the sum of the digits of n. Let f 2 (n) denote f(f(n)), f 3 (n) denote f(f(f(n))) and so on.
Then f 1998 (11) =
1. 49
2. 256
3. 169
4. 16
5. 196
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