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NESA website more or less confirms that students will be given a choice.

The question states how many ways you can do if at least two students sit together so either you take cases (if 2 students sit together, if 3 sit together, if 4..., if 5... and so on) OR you do as @devtrivedi did which is much quicker, you do: total - arrangements of the boys all separated (do...

The premium version of Adobe Acrobat that all students can get for free from the government has an edit PDF feature!

Excuse my terrible handwriting: but this hopefully should explain why you subtract the two sums

The first statement that “the sum of 50 terms of an arithmetic series is 249” basically means that a1 + a2 + ...... + a50 = 249 (just think a1, a2... a50 as numbers in order in an arithmetic series). The second statement: “sum of 49 terms of the series is 233” can be written as a1 + a2 + .... +...

1. a) As Bronsted-Lowry theory states, acids are proton donors and, bases are proton acceptors (here proton can be thought of as H+ since hydrogen itself only has one proton too). So we know sulfuric acid is an acid and is reacting with water, thus the H2SO4 donates a H+ and the water accepts...