Find the rules, the first line 1 ~ 4, the second line 5 ~ 9, the third line 10 ~ 16 How many numbers are there in line 8? 4 is 4, 9 is 5, 10 ~ 16 is 7 How many numbers are there in line 8? How many numbers are there in lines 1 to 10~

Find the rules, the first line 1 ~ 4, the second line 5 ~ 9, the third line 10 ~ 16 How many numbers are there in line 8? 4 is 4, 9 is 5, 10 ~ 16 is 7 How many numbers are there in line 8? How many numbers are there in lines 1 to 10~

Line 8 has 32 numbers
Let A1 = 4,
a2=5,
a3=7
.
However, a2-a1 = 5-4 = 1,
a3-a2=7-5=2,
a4-a3=10-7=3,
.
There are,
a1+a2+a3+a4+...+a10=4+5+7+10+14+19+25+32+40+49=205.

The first line is 1.4.5.10, the second line is 4.8.10.12, and the third line is 9.12.15.14. What are the rows and columns of the number 100

The first column, an = n ^ 2100, is in row 10
In the second column, an = 4N, 100 is in row 25
The third column, an = 5N, 100 in line 20
The fourth column, an = 2n + 8100, is in line 46

2, 27, 11, 18, 38, 11, 83, ()

Odd number rule: 2 + 1 * 9 = 11,11 + 3 * 9 = 38,38 + 5 * 9 = 83
Even digit rule: 27-9 = 18, 18-7 = 11, so, () = 11-5 = 6

Fill in the blanks so that the sum of the three numbers in the horizontal, vertical and oblique lines is 45. The last digit of the first line is 21, the last digit of the second line is 6, and the second digit of the third line is 13
Please give me an answer

Wrong question. In the end, the three numbers from top left to bottom right are not equal to 45, but the rest are consistent
Check again

Fourth grade, the Mathematical Olympiad to find the law of the problem: 7,3,5,4,8,2,3,1,9,2,6,2 have Mathematical Olympiad master please help, thank you!
This is a homework problem in children's class! It's not a trick!
There's no space in the back

Don't think too complicated
The rule of this problem is simple odd even alternation, three odd and three even alternation
7,3,5 odd numbers
4,8,2 even numbers
3,1,9 odd
2,6,2 even

The following is a triangle matrix: 12 & nbsp; & nbsp; & nbsp; & nbsp; 4 & nbsp; & nbsp; & nbsp; & nbsp; 23 & nbsp; & nbsp; & nbsp; & nbsp; 6 & nbsp; & nbsp; & nbsp; 9 & nbsp; & nbsp; & nbsp; & nbsp; 6 & nbsp; & nbsp; & nbsp; & nbsp; 34 & nbsp; & nbsp; 8 & nbsp; & nbsp; & nbsp; & nbsp; 12 & nbsp; & nbsp; & 12 & nbsp; & nbsp; & nbsp; & 8 & nbsp; & nbsp; & nbsp; 4 According to the law of the number matrix, we guess that the sum of all the numbers in the tenth row is______ ．

The sum of all the numbers in line 10 is 103 = 1000

Mathematical sequence problem: find the fifth line
First line: 1
The second line: 1
The third line: 2 1
The fourth line: 1 2 1
The fifth line:
Why?

The first line: 1, the second line: 1, the third line: 2, the fourth line: 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1

The last term of the fifth, sixth, and seventh row of a sequence of numbers consisting of triangles

a1=1
a2=3
a3=6
a4=10
.
an=n(n+1)/2
a5=15
a6=21
a7=28
What is the decreasing formula?

Sequence: 1, 11, 21, 12111, 11221 next

In your question, 11, 11 --- denotes that the previous number "1" is a 1; 21 --- denotes that the previous number "11" is composed of two 1; 1211 --- denotes that the previous number "21" is composed of a 2 and a 1; 111221 --- that is, 11, 12, 21 --- denotes that the previous number "1211" is composed of

-2,4, - 8,16, - 32,64.0,6, - 6,18, - 30,66... - 1,2, - 4,8, - 16,32. What is the relationship between the number of lines 2,3 and the number of lines 1
Let the tenth number of the first row be a, the tenth number of the second row be B, and the tenth number of the third row be C, and then find the value of a + B + C

First line: (- 2) ^ n
Second line: (- 2) ^ n + 2
The third line: - - 2) ^ (n-1)
a+b+c=(-2)^10 +(-2)^10 +2 + [-(-2)^(10-1)]=(-2)*(-2)^9 +(-2)*(-2)^9 +2 -(-2)^9
=(-2)^9 *(-2-2-1) +2=(-512) * (-5) + 2=2562