book Maths Puzzle Numerical Ability

Prove or disprove the following:
(1)The product of three consecutive integers is even.
(2)For every positive integer n, n2+n+1 is a prime number.

The first one i have used p

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book Other Question

solve triangle ABC using the given info...

a=4, b=6, c=9. please help me!!! and if you could explain that would be great, im so lost!
CD=6 and AD=4 then DB=?