Divisibility by 11 Proof

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Hello welcome to the 'As it were' Maths YouTube Channel! I love maths and I am in the Sixth Form. The purpose of this channel is to help those of you out there who like maths as much as I do. Thanks and I hope you enjoy!
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Thanks a lot for this video, I already knew the alternating sum rule to test whether a number is a multiple of 11 or not, but I didn't know the why it worked, so again, thanks a lot!

stevennunn
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around 1:20 you said 1001b but u wrote 10001b, just in case somebody didn't get it so i mentioned it here :3 (1001 is divisible by 11)

tacku