checking algorithm and odd roots of negative numbers

gistfile1.txt

{	notes: ""
	name: example
	percentPass: 50
	shuffleQuestions: false
	rulesets:{
			std:[all,fractionNumbers, !collectNumbers,!noLeadingMinus]
			}
			
	navigation: {
		allowregen: true
		showfrontpage: false
		reverse: true
		browse: true
	}

	feedback: {
		showtotalmark: true
	}

	questions: [
				{
			name: example
			statement: """
			Input $(1-x)^{1/3}$

			
			"""
		

			parts: [
				{
					type: gapfill

					prompt:"""
					Solution is:
					$y=\;\;$[[0]]
					
		

					
					"""

					gaps: [

						 { type: jme
						  answer: "(1-x)^(1/3)"
						  answersimplification: "std"
						  vsetrange:[2,3]
						  marks:1
						  }

					
					]
				}
				
				
			]

			advice: """
		
			
			"""

			}

	]
			
			
}