you have two possible responses to your game to reach the same point, if you take the base add 7 and 8 otherwise ex 2 next com 2Ć3=6*3Ć4=12*4Ć5=20*5Ć6=30*6Ć7=42*7Ć8=56*8Ć9=72
or since in your game there is neither 7 nor 8, you can put in the middle of each addition a number starting from 3,4,5,6,7,8 without considering where the 7 and 8 are originally resulting in 72
you have two possible responses, take the base to multiply them together like in the example 2x3=6, 3Ć4=12, 4Ć5=20, 5Ć6=30, 7x6=42, 8x6=48, 9Ć7=63 or... the next comment will follow