Question
What is the fourth term of (x – 5y)96?
- 125 96C3 x93 y3
- 625 96C3 x93 y4
- 625 96C4 x92 y4
- 125 96C4 x92 y4
Hint:
Use the bionimal formula for the 4th term to find the forth term.
The correct answer is: 125 96C3 x93 y3
STEP BY STEP SOLUTION
Tr + 1 = nCr xn – r yr
Here, the first term is 4, and the second term is 5y.
n = 96
r = 3
Therefore, Tr + 1 = 96C3 x96 – 3 (5y)3
= 125 96C3 x93 y3
Therefore, Tr + 1 = 96C3 x96 – 3 (5y)3
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