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It looks like (b^2)^5

First level is 1 1

Second level is 1 2 1

Third 1 3 3 1

fourth 1 4 6 4 1

fifth 1 5 10 10 5 1

So you know the coefficients before each number is going to be the fifth row. Then you plug in your formula.

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14y ago

What else can I help you with?