6.

Evaluate the expression. 2! + 4! OA 8 OB 720 OC 27 OD 26What is a factor of 5 + 3 for all natural numbers n? OA 23 OB 4 OC 22 OD 5Carry out the expansion. (a - 2b)9 OA a" + 18ab - 144a b2 + 672a63 - 2,016a5b4 + 4,032a4b5 - 5,376a3b6 + 4,608a 2b 7 - 2,304ab $ + 51269 OB a9 + 18ab + 148ab2 + 672a 6b3 + 2,016a$b4 + 4,032a4b5 +5,376a3b6 + 4,608a 2b7 + 2,304ab $ + 51269 OC a9 - 18ab + 144ab2 - 672ab3 + 2,016a$b4 - 4,032a4b5 + 5,376a3b6 - 4,608a 2b7 + 2,304ab $ - 51269 OD a9 - 18ab - 144ab2 - 672ab3 - 2,016a5b4 - 4,032a4b5 - 5,376a3b6 - 4,608a 2b 7 - 2,304ab 8 - 51269In a binomial expansion, when n is even, the coefficients are 0 A symmetric about the two middle terms 0 B increasing 0 C symmetric about the middle term 0 D decreasing In a binomial expansion, when n is odd, the coefficients are 0 A symmetric about the two middle terms 0 B decreasing O C increasing 0 D symmetric about the middle term