Well, isn't that a lovely pattern you've got there! If we look closely, we can see that each number is decreasing by 10. So, the pattern rule for this sequence is to subtract 10 from the previous number to get the next one. Keep exploring patterns, my friend, and let your creativity flow!
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explain how to find the rule in a numerical pattern
The rule for the pattern is y=x+2. That rule is in the table format in which it would originally be in, but the worded rule would be 'It increases by 2 each time'.
multiply by three
Times one, doubled, times one, doubled...
There are actually more than a pattern rule for that type of sequence. The pattern rule is not obvious. The sequence is actually this: an = 5a(n - 2) for n > 2, such that the seed values are a1 = 1 and a2 = 5. Another pattern rule is the number of palindromes using a maximum of five different symbols. The third one is the Inverse Binomial Mean transformation of the Fibonacci sequence.