Puzzle
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Your support makes all the difference.I SPOTTED Prof Mindwarp at the cash dispenser the other day and asked him how his finely honed mind managed to remember his PIN numbers. "Trivial," he said. "It's a four-digit perfect square - not beginning with zero, of course - and its square root is given by reversing its middle two digits."
"And do you use the same number for your other cash card?" I asked.
"Certainly not!" he replied. "Though that is also a four-digit perfect square, and I can tell you that it comprises four consecutive digits, though not in the right order, of course." What are the Prof's numbers? (Answer on Monday).
Yesterday's answer:
2+1 cross; 1 returns; 10+5 cross; 2 returns; 2+1 cross: Total time: 2+1+10+2+2 = 17 minutes.
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