How to solve
(_-1+2-3+4-5+6-7+8-9+10

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Solution

-1+2-3+4-5+6-7+8-9+10 = 1-3+4-5+6-7+8-9+10
= -2+4-5+6-7+8-9+10
= 2-5+6-7+8-9+10
= -3+6-7+8-9+10
= 3-7+8-9+10
= -4+8-9+10
= 4-9+10
= -5+10
= 5
general formula => sum= n = number of even numbers = number of odd numbers
here it is = 5

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Similar questions

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Q. Solve the following equations.
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If
A = {1, 2, 3, 4}

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$\begin{matrix} C o l u m n A & C o l u m n B 1. A \cup B & a . {3, 4, 6, 7} 2. A \cap B & b . \emptyset 3. (B \cap C) \cup D & c . {3, 4} 4. B \cup C \cup D & d . {3, 4, 5, 6, 7, 8, 9, 10} 5. (A \cap B) \cap (B \cup C) & e . {1, 2, 3, 4, 5, 6, 7} f . {6, 7, 8, 9, 10} g . {7} \end{matrix}$

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In a Mathematics test, the following marks were obtained by 40 students. Arrange these marks in a table using tally marks.

8	1	3	7	6	5	5	4	4	2
4	9	5	3	7	1	6	5	2	7
7	3	8	4	2	8	9	5	8	6
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(b) How many students obtained marks below 4?

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How to solve (_-1+2-3+4-5+6-7+8-9+10

-1+2-3+4-5+6-7+8-9+10 = 1-3+4-5+6-7+8-9+10 = -2+4-5+6-7+8-9+10 = 2-5+6-7+8-9+10 = -3+6-7+8-9+10 = 3-7+8-9+10 = -4+8-9+10 = 4-9+10 = -5+10 = 5 general formula => sum= n = number of even numbers = number of odd numbers here it is = 5

How to solve
(_-1+2-3+4-5+6-7+8-9+10

-1+2-3+4-5+6-7+8-9+10 = 1-3+4-5+6-7+8-9+10
= -2+4-5+6-7+8-9+10
= 2-5+6-7+8-9+10
= -3+6-7+8-9+10
= 3-7+8-9+10
= -4+8-9+10
= 4-9+10
= -5+10
= 5
general formula => sum= n = number of even numbers = number of odd numbers
here it is = 5