24 is.
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The next number in the sequence 3-15-6-30-21 is -207.
24 The series formula is A(n) = n2 - 1 12 - 1 = 0 22 - 1 = 3 32 - 1 = 8 42 - 1= 15 52 - 1 = 24
The next number is -21
0 9-3=6 6-3=3 3-3=0
21: (3)+3=(6)+4=(10)+5=(15)+6=(21)