Problem with variables

Hya all,I have this true/false type of question.I want to make an image from an hidden state, set to a visible state. Only when a student click on the radio button that correspond with the right anwser.I have setup a kind of mechanisme but it doesn't work.I've created a variable called 'check', and set the initial value to 0.I have the true/false question, and have an action on one of the radio buttons.This action is a 'modify variable' type, and the target is the variable 'check' to set the value to 1.And i have an action located in the same page as the question and image.The action properties contains:on: 'show'Action: 'show'Traget 'image'It only preforms this action when the variable 'check' is greater than 0.But it don't work.What did i have done wrong?Thanx in advance!

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