Question

Show that one and only one out of n, n+ 2 or n +4 is divisible by 3, where n is any
positive integer
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Answer 1

Answer:

Step-by-step explanation:

n+2 = 3q+2+2 =3q+4 = 3(q+1)+1 is not divisible by 3. n+4 = 3q+2+4 = 3q+6 = 3(q+2) is divisible by 3. thus one and only one out of n , n+2, n+4 is divisible by 3

Answer 2

Answer:

These obelisks were believed to have been constructed around 3500 BC and a shadow would be cast by the obelisk as the sun made it's way across the sky. ... This shadow clock or sundial permitted one to measure the passage of hours within a day. Another very early form of clock to tell the time was the water clock.Oct 20, 2016