9 1.63 ... The first is to find every other pattern. 1.3.5.7 ... so it's 92.4. 12.48 ... which means 2 * 2 = 4 4 * 3 =12/2 * 4 = 48, and the next one is 48 * 4 =/. 3.7. 15.3 1 each times 2 and then times+1, and 4 9 16 25 is a complete square number, that is, 2 * 2 = 43 * 3 = 94 * 4 = 65438.