Assume the sales representative calls 6 customers, and each call has 4 possible results: reaches the customer in person, gets an
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The second term of the expansion is .
Solution:
Given expression:
To find the second term of the expansion.
Using Binomial theorem,
Here, a = a and b = –b
Substitute i = 0, we get
Substitute i = 1, we get
Substitute i = 2, we get
Substitute i = 3, we get
Substitute i = 4, we get
Therefore,
Hence the second term of the expansion is .
