write the formula of binomial theorem
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Binomial theorem. by finding the rth entry of the nth row (counting begins with a zero in both directions). ... Thus, the powers of (a + b)n are 1, for n = 0; a + b, for n = 1; a2 + 2ab + b2, for n = 2; a3 + 3a2b + 3ab2 + b3, for n = 3; a4 + 4a3b + 6a2b2 + 4ab3 + b4, for n = 4, and so on.
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