The sum of the coefficients of all the terms in the expansion of (5x − 9)4 is __________.
Explanation:
Sum of the coefficients of all the terms in the expansion of (ax − b)n can be obtained by substituting x = 1.
∴ Sum of the coefficients of all the terms in the expansion of (5x − 9)4 = (5 - 9)4 = 44 = 256.
Hence, 256.
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