Identify a pattern in the list of numbers. Then use this pattern to find the next number.
a. 3, 9, 15, 21, 27, _____
b. 2, 10, 50, 250, _____
c. 3, 6, 18, 72, 144, 432, 1728, ____
d. 1, 9, 17, 3, 11, 19, 5, 13, 21, _____
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