Q. Look at these growing patterns. Find out what to add to each number to get the next one:
(a) 1, 3, 6, 10, _____, _____, _____, _____, _____
(b) 0, 2, 6, 12, _____, _____, _____, _____, _____
(c) 1, 3, 7, 13, _____, _____, _____, _____, _____
(d) 2, 3, 6, 11, 18, _____, _____, _____, _____, _____