Puzzles

I remember last year RI was infected by this computer puzzle game called the wicked. Some comp genius was inspired by dan brown's digital fortress or something and decided to create the wicked. So obviously chong min decided to try this puzzle, and in turn create his own. And so obviously i also did the same. Kinda hard to resist this kinda things.

So i decided to create some puzzles last year. And i found the book today. So today, as a present to my mum, whose birthday is today, i decided to post some puzzles for all to enjoy. (Actually no relation cos she doesnt read my blog)

Anyway, here's a puzzle (for maths lovers):

OTTFFSSENT_TTFFSSE

Fill in the blank.

Here's another one (for history lovers):

#09-08-65 (small apartment)
#31-08-57
. .
. .
. .
. .
#0_-07-76 (large apartment)

Fill in the blank.

Here's another one (for children):
Count .

1+1+1+...= ?

What is the answer?