Question

if a is divisible by neither 2 nor 3, show that a²-1 is divisible by 24.​

Answer 1

Answer:

Step-by-step explanation:

Among any three consecutive numbers one would always be a multiple of 3 , so as a is not divisible by 3 either of (a-1) and (a+1) is divisible by 3 . Hence , if a is divisible by neither 2 nor 3 then a²-1 is divisible by 24 .