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Each number is 15 less than the number before it.....

While this person is quite right in stating that you remove 15 to get the next number, the rule is usually an equation that can be used to find the nth term, rather than relying on a previous number. In this case a possible rule is '340-(15n)' 'n' being the letter used to substitute the term of the pattern. For example the 2nd term in this pattern is 310. Because BEDMAS states that we have to do brackets first, we multiply 15 by 2, which equals 30. 340-30 is 310, which is the 2nd term. We can apply this rule to every term in the pattern, so we know it works.

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12y ago

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Q: What is the pattern rule for this pattern 325-310-295-280?
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