Answer:
20
Explanation:
the pattern is increase the number by one more than the increase before. so 6,8=2 greater
8-11=3 greater. 11-15=4 greater. so, 15+5=20 (with this answer being 5 greater continuing the pattern.)
6 + 2 = 8
8 + 3 = 11
11 + 4 =15
15 + 5 =20
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