exam Maths Puzzle Numerical Ability

can you help me with this problem please:

using the digits from 0 through 9, arrange them in fraction form to produce a sum of 1.

thank you very much i really need your help.

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exam Other Question

Having problems simplifying (-R2/R2CS+1)/R1. Any assistance in the explanation would be greatly appreciated. I am having a hard time understanding constants. Here is my problem: Determine the constant k so that the graph of 3x+(k-1)y=k+1 will have slope 5.

Thank you.