Question

THIS one u probably have to choose more than one

Answer 1

once again I don't know if I'm right
1. an = 2an - 1 + 1
2. an = 3an - 1
3. an = an - 1 + 6

Answer 2

Replace
`a_(n)` with 27, solve for
`a_(n-1)`, and see if the result is a whole number.

27 = 2a ⇒
`(27)/(2)` = a not a whole number NO

27 = 2a + 1 ⇒ 26 = 2a ⇒ 13 = a 13 is a whole number YES

27 = 3a ⇒ 9 = a 9 is a whole number YES

27 = 3a + 6 ⇒ 21 = 3a ⇒ 7 = a 7 is a whole number YES

27 = 3a + 1 ⇒ 26 = 3a ⇒
`(26)/(3)` = a not a whole number NO

Answer: B, C, D