(1)
8n - 7n - 1 is always divisible by ____.
Answer: 49
Answer: 49
Answer: 2n - 1
Answer: 6th and 7th terms
Answer: 2905
Answer: 10th term from the beginning
Answer: 128
Answer: 13
Answer: 3/2
Answer: 11
Answer: 4
Answer: 21
Answer: 61
Answer: 0
Answer: 400
Answer: 2728
Answer: n = 2r
Answer: 5th and 6th
Answer: 2:1
Answer: 7
Answer: 2