Another little mistake in the Options Strategies tutorial, regarding the definition of a straddle, where the put and the call should in fact have the same strike K
(where you give instead the definition of a strangle, seems to be a fat finger copy/paste )
In the same tutorial, I am not sure the ‘collar’ definition is correct : it is given as the opposite of a risk reversal.
In my understanding, the opposite of a (bullish) risk reversal is just a (bearish) risk reversal.
A collar would be a short risk reversal plus a long position in the underlying stock (cf Wikipedia or Investodia)
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