The Prime Minister suggested that, realistically, it would take at least five years to purge corruption from a police force that is 200,000 strong. About 10 per cent of the force are assumed to be on the take.
... SAL KHAN: We have a few-- don't take offense. ...
... property. Suppose I take the series of numbers, one, two, four, eight, 16, 32 and so forth. ...