6. Given the sum Sn = n² of the sum of the first n terms of an arithmetic sequence. What is the 100th term of this sequence? A. 201 B. 199 C. 101 D. 99 7. The sum of the first 50 terms of an arithmetic sequence is 1275 and the sum of the next 50 terms is 3775. What is the common difference? A. 1 B.2 C. 3 D. 4 8. How long it will take to payoff debit of 44,180 ETB if 120 ETB is paid the first month 125 ETB is paid the second month, 130 ETB is paid third month and so on? A. 37 B. 47 C.57 D. 67​