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Mathematics news on Phys.org

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The pattern you wrote is extremely easy ! (i don't see the weird thing about it)

Multiplying a number by 10 means adding it to itself 10 times.

Multiplying a number by 9 means adding it to itself 9 times.

So if you multiply X by 9 then add X to it, it is just like if you multiplyed it by 10 from the first place.

Here is a smaller example :

On the same basis, if you multiply any number by 2 then add itself, it is just like multiplying by 3 from the first time.

1+1+1=(2*1)+1=3*1

2+2+2=(2*2)+2=3*2

X+X+X=(2*X)+X=3*X

Same for your pattern.

Or maybe i am missing something ...

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