Question

Dr. Tenma is standing on the first stone in a row of stones numbered numbered from
1
to
20
from left to write. Tenma is trying to catch Johan standing the
20
t
h
stone. So Johan has set bombs on the stones with prime number. Tenma is able to jump either
1
,
2
or
3
stones to the right.. How many sequences of jumps are there that allow Tenma to catch Johan avoiding the bombs.

Answer 1

9 Jumps is the answer

See in image how Tenma needs 9 jumps

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