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write |dw:1349805212895:dw|

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For the final step, you can use the hints given to you by @experimentX

Please let me know if you require any further explanation.

I will attempt this in a few hours again... I have to go into Uni right now.

ok - good luck! :)

yeah you are correct ... you can use this law to show for n=3,4,... up to n

Excellent. I understand it now.
Out of curiosity, is my direct proof also valid?

now show it for n=3 and n=4

Great! Thank you for your help!

yw.