ಖಾಲಿ ಜಾಗವನ್ನು ತುಂಬಿರಿ: 0, 2, 6, ______, 20, 30, 42

The terms are n(n − 1): 0, 2, 6, 12, 20, 30, 42 (differences 2, 4, 6, 8, 10, 12). The blank is 12.