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What are the rules of 2, 3, 61015, 21, 28, 36, 45, 55, 66
Except for the first number 2, the remaining numbers are all "triangle numbers", forming a continuous "triangle number" sequence 3 = 1 + 26 = 1 + 2 + 310 = 1 + 2 + 3 + 415 = 1 + 2 + 3 + 4 + 5 66 = 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + 11 ...
1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+.+1/2021055
1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+.+1/2021055=1+1/（1+2）+1/（1+2+3）+1/（1+2+3+4）+…… +1/（1+2+…… +2010）=2/（1*2）+2/（2*3）+2/（3*4）+2/（4*5）+…… +2/（2010*2011）=2*（1-1/2+1/2-...
Simple operation of 1:12 and 36 - (11:1-36 + 2:4)
=12 and 36 1 + 36 11 - (1 + 2 and 11 4)
=12 1 / 3-3 4 / 11
=9 and 1 / 33
How to calculate the total number of 36 * 35 * 34 * 33 * 32 * 31 * 30 / 7 * 6 * 5 * 4 * 3 * 2 * 1 = 8347680
THANK YOU!
36*35*34*33*32*31*30
7*6*5*4*3*2*1
36/4＝9
35/7＝5
34/2＝17
33/3＝11
30/5/6＝1
5*9*11*17*31*32＝ 8347680
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