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Feliz [49]
3 years ago
7

What is the fifth term in the expansion of (3x - 3y)7? __ x3y4

Mathematics
2 answers:
olga2289 [7]3 years ago
7 0
(r+1)th term of (a +x)^n = nCr a^(n-r)x^r

so 5th term of (3x - 3y)^7  = 7C4 * (3x)^(7-4) (-3y)^4      (NOTE r = 4)

=   35 * 27x^3 * 81y^4

=  76545 x^4y^3
Dafna11 [192]3 years ago
5 0

Answer: 76545


Step-by-step explanation: That is what you need to enter on edge


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