Brain Teasers
Big Number
Multiply by 7 the number of 8's immediately followed by 3, but not by 5, in the number below:
381654783298514285838385737983256941837408326
It looks a lot harder than it really is!
381654783298514285838385737983256941837408326
It looks a lot harder than it really is!
Answer
Simply count the occurrences of 83There are 6 (six) 8's followed by 3
Now multiply it by 7
Hence the answer is 42.
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