exam Maths Puzzle Numerical Ability

A bag contains 15 billiard balls, numbers consecutively from 1 to 15. Six balls are selected at random. What is the probability that the sum of the numbers on the billiard balls will be odd?

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exam Other Question

The perimeter of an equilateral triangle is 18. Find its area. Please Help me!

I need to find if the seqence is geometric. Then if it is find the next two terms.

Here are a few I need help with:

1. 18,-6,2, (-2/3)

2. 10,15, 22.5,