Question

2. The largest number that exactly divides each
number in the sequence (15 – 1), (2 – 2),
(35 – 3), (45 – 4), ..... (n– n) is :
(a) 1
(b) 15
(c) 30
(d) 120
​

Answer 1

answer is one because the term (35-3) is not divisible by 15,30,120 so the answer is 1