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Let's do it in stages: 1. The difference between each number is 3 - Let's call this 3n. 2. If N was one, 3n is the 3 x 1 which is 3. However, the first number is 7. So, we need to add 4. This means the formula is 3n+4 3. Since we need to find the 26th term, we jsut replace N with 26. So, 3 x 26 + 4 = 82. The final answer is 82.
Notice that the sequence is increasing by 3 each term. If 7 is the first term then the 26th term will have been increased by 3 points 25 times, so it will be 7 + 75 = 82. (Note: it's quite a tricky question because one would expect 1 to be the first term in a sequence like that, e.g. 1, 4, 7, 10, etc - but reading the question carefully the sequence actually starts from 7).