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Llana [10]
3 years ago
9

What is the next number in the series? 5, 15, 10, 13, 15, 11, ___

Mathematics
1 answer:
Anika [276]3 years ago
5 0
If we take the sequence terms apart and write the odd-numbered terms (the first, third, fifth, etc) and the even-numbered terms (the second, fourth, sixth, etc) in<span> own sequences we will get:
5     10    15
15   13    11
So, in the first sequence every term is obtained by adding five to the previous, and in the second sequence every term is obtained by subtracting 2 from the previous term. According to this logic, the next number in the series </span><span>5, 15, 10, 13, 15, 11, 20.</span>
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