B. Find the 7th and 15th term of each swquence. (2pts. Each) 九 1. an= 2 3(n+1) 6. An= 1+2 2. a₁ = 5-1¹ 7. a = 4 + 3(n-1) 2n 3n-1 3. An= 8. An= 4n-1 71 n²-4 n(n+1) 4. An= 9. An= n²+2 5. an-3-1 + 2/1/20 3-=+ 10. an = n(n-2) (n-3) 111​