Homework SourseeSt lN Solution9a First 9 terms The pattern is 445452453 So
eSt lN 
Solution
9.a. First 9 terms
The pattern is
4,4*5,4*52,4*53
So the next terms are
4*54,4*55,4*56,4*57,4*58
2000, 8000,32000,128000 ,512000
b.4th term of (2x-3y)7
7C0(2x)7+7C1(2x)6(-3y)+7C2(2x)5(-3y)2+7C3(2x)4(-3y)3+7C4(2x)3(-3y)4+7C5(2x)2(-3y)5+7C6(2x)(-3y)6+7C7(-3y)7
Fourth term is 7C3(2x)4(-3y)3=-15120x4y3
