November 2011







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Count the crows

Crows

I don't know why a flock of crows is called "murder". This murder of crows (or are they rooks?) I saw had definitely not committed any murder but were, anyway, feasting on carrion.

When I approached them, the square root of half the number of crows took flight. Two other crows hopped to the side, and the remaining number of crows, that comprised eight-ninths of the whole flock, continued to feast undisturbed.

Can you tell me how many crows in all were there in the flock?







Click here for the solution

Some useful links for
your career:


  • Union Public Service Commission - www.upsc.gov.in
  • IIT-Kharagpur - www.iitkgp.ac.in
  • Indian Statistical Institute - www.isical.ac.in
  • Indian Institute of Technology Madras - www.iitm.ac.in
  • Indian Institute of Management, Ahmedabad - www.iimahd.ernet.in
  • Indian Institute of Mass Commission - www.iimc.nic.in
  • IIT Bombay - www.iitb.ac.in
  • Indian School of Mines, Dhanbad - www.ismdhanbad.ac.in
  • Birla Institute of Technology, Ranchi - www.bitmesra.ac.in
  • Central Institute of Fisheries Nautical and Engineering Training - www.cifnet.nic.in
  • Indian Institute of Information Technology, Allahabad (Deemed University) - www.iiita.ac.in
  • Central Marine Fisheries Research Institute, Kochi - www.cmfri.com
  • Tata Institute of Social Sciences, Mumbai - www.tiss.edu

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