How to delete rows in DataFrame?

New to Julia
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2 
julia> deleteat!(df, findall(==(:C), df.group)[2])
7×2 DataFrame
 Row │ group   X     
     │ Symbol  Int64 
─────┼───────────────
   1 │ A         101
   2 │ A         102
   3 │ B         103
   4 │ B         104
   5 │ C         105
   6 │ C         107
   7 │ C         108

Assumes that there is a second line that starts with C i.e. assumes there are at least two Cs in the group column.

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