The probability that two of your classmates will become Principal Secretary to the Prime Minister is as close to zero as you can imagine, what they call epsilon in differential calculus.
But epsilon tending to zero does not mean zero. And therefore the probability is what the maths wallahs call non-zero, non-negative. It is for that reason two of my classmates from the Delhi School of Economics, batch of 1970-72 have made it to that utterly thankless job.
The first to get there was Pulok Chatterjee in 2012. And now it is Pramod Kumar Mishra.
Pulok came to