What is the number 25 of the first line 1, the second line 2, 3, the third line 4, 5, 6, the fourth line 7, 8, 9, 10, the 100th line

What is the number 25 of the first line 1, the second line 2, 3, the third line 4, 5, 6, the fourth line 7, 8, 9, 10, the 100th line

4975,1+2+3+… 99 = 4950, add 25

What is the 25th number in line 100
What is the 25th number in line 100
2 3
4 5 6
7 8 9 10

Your question seems to be a triangular arrangement of natural numbers
Research on the triangle arrangement of natural numbers
1） 1
2） 2 3
3） 4 5 6
4） 7 8 9 10
5） 11 12 13 14 15
6） 16 17 18 19 20 21
7） 22 23 24 25 26 27 28
8） 29 30 31 32 33 34 35 36
9） 37 38 39 40 41 42 43 44 45
10） 46 47 48 49 50 51 52 53 54 55
…… ……
Analysis: the first line has 1 number; the second line has 2 numbers; the third line has 3 numbers; the fourth line has 4 numbers; the fifth line has 5 numbers; the sixth line has 6 numbers There are n numbers in the nth row, and the last number in the nth row is,
So the number on n-th row and n-th column is - 1
The number on line n (n-1) column is - 2
The number on line n (n-2) is - 3
The number on line n (n-3) is - 4
The number on line n (n-4) is - 5
The number on line n (N-5) is - 6
…… ……
The number on the n-th row and m-th column is - (m-1)
You can check my arrangement rule in Baidu Library