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?

c. 27 units.

step-by-step explanation:

we are told that in circle a, ∠bae ≅ ∠dae.

we can see from our given diagram that in and ;

, as these are radii of our given circle.

therefore, by sas congruence postulate.

hence, side be will be equal to side de as corresponding parts of congruent triangles are congruent. so we can set an equation to find the value of x as:

now let us substitute x=17 in the expression for the length of be.

therefore, length of be will be 27 units and option c is the correct choice.