A bag contains n counters. One counter is blue and one is red.
Two counters are taken at random from the bag.
a, express in terms of n, the probability that a counter of each colour is taken. Give as a fraction in its simplest form.
b, the probability that a counter of each colour is taken is 0.125
How many red counters are in the bag?

On the way home from visiting his family, vincent’s plane cruised at an altitude of 3.2 × 10^4 feet. he had heard that a man named felix baumgartner skydived from an altitude of 1.28 × 10^5 feet. vincent wants to know how much higher felix went on his skydiving trip. question 1 you have already seen how adding numbers works in either scientific notation or standard notation. but can you subtract numbers in scientific notation and get the same results as subtracting in standard notation? to find out, first solve vincent’s problem in standard notation. part a write the cruising altitude of vincent’s plane in standard notation.