1. Use the multinomial theorem to find the coefficient of a't'e in the expansion

of a + b – 3 – 2)

ta + 3b²-3c-2)*

۹

6713!

x, 12

۰ - ۱۸

-2

x3

او

2. Determine the number of integer solutions for

2 + 1 + 13 < 10

where 1 - - 2,1 > 1, 13 2 2.

23

3( - 3) (2)

(1) 3

2131 131

(|| 13) !

11 31

10 دارد = x, 12 + x3 + 2 + x

ی

0.5

3