1) If Jonathan and Sibo are placed next to each other we may consider this pair as one element. Then there are "10-1=9"
elements. The number of possible arrangements
There are 2 arrangements in pair Jonathan and Sibo.
Hence the total number of arrangements is
2) If Jonathan is placed in the first lane, then Sibo can be placed in the third, fourth, ..., tenth lane:
If "n=10"
There are 8 other competitors.
The number of possible arrangements is
Hence the total number of arrangements is
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