Brain Teasers
The Missing Link
The following number chain is missing a link. You must discover the algorithm to determine the missing link.
123, 861, 602, 421, 294, ?, 143, 100, 700, 490, 343
123, 861, 602, 421, 294, ?, 143, 100, 700, 490, 343
Hint
There are two steps in the algorithm. The first step is multiplication. The second step is conditional.Answer
The missing link is 205. Each new link in the chain is the previous link multiplied by 7, with the units digit deleted if the result has more than three digits (294 * 7 = 2058, deleting the units digit results in 205).Hide Hint Show Hint Hide Answer Show Answer
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