Combinatorics of geometrically distributed random variables: new<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$q$" id="E1"><mml:mi>q</mml:mi></mml:math>-tangent and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" alttext="$q$" id="E2"><mml:mi>q</mml:mi></mml:math>-secant numbers
International journal of mathematics and mathematical sciences