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Probability that Ria takes Green then Blue is 7/9 * 2/8 = 14/72. Probability that Ria takes Blue then Green is 2/9 * 7/8 = 14/72. Added together we get 28/72 = 7/18.

The -OH is an activating group, it donates its lone pair into the delocalised ring of electrons. This increases the electron density in the ring, making it more reactive.

3x^2 = 48 x^2 = 16 x = 4

We know the roots of the equation 3x² - 5x + 4 = 0 is P & Q, therefore is is equivalent to (x - P)(x - Q...