added solution and question
Merge remote-tracking branch 'upstream/master'
Merge pull request #639 from adamarla/master

corrections to questions
added watchout message
Merge pull request #640 from adamarla/master

added watchout message
added versions
Merge remote-tracking branch 'upstream/master'
Merge pull request #641 from adamarla/master

Added versions
added diagram and corrections
Merge pull request #642 from adamarla/master

added diagram and corrections
Merge pull request #643 from abhinavc/master

Added the 8 questions Shreemoy sent for IIIT-D economics test
added solution and versions
Merge pull request #644 from adamarla/master

added solution and versions
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