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Some points on a plane are marked and th...

Some points on a plane are marked and they are connected pairwise by line segments. If the total number of line segments formed is 10, find the number of marked points on the plane.

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The correct Answer is:
`therefore` The number of points marked on the plane is 5.
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VIKRAM PUBLICATION ( ANDHRA PUBLICATION)-QUADRATIC EXPRESSIONS-TEXTUAL EXERCISES
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  2. Find the roots of the following equations. x^(2)-7x+12=0

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  3. Find the roots of the following equations. -x^(2)+x+2=0

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  4. Find the roots of the following equations. 2x^(2)+3x+2=0

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  5. Find the roots of the following equations. sqrt(3)x^(2)+10x-8sqrt(3)...

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  6. Find the roots of the following equations. 6sqrt(5)x^(2)-9x-3sqrt(5)...

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  7. Form quadratic equation whose roots are : 2,5

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  8. Form quadratic equation whose roots are : (m)/(n), (n)/(m) (m ne 0, ...

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  9. Form quadratic equation whose roots are : (p-q)/(p+q), (-p+q)/(p-q),...

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  10. Form quadratic equation whose root 7 pm 2sqrt(5)

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  12. Find the nature of the roots of the following equation, without findin...

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  13. Find the nature of the roots of the following equation, without findin...

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  14. Find the nature of the roots of the following equation, without findin...

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  15. Find the nature of the roots of the following equation, without findin...

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  16. If alpha, beta are the roots of the equation ax^(2)+bx+c=0, find the v...

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  17. If alpha, beta are the roots of the equation ax^(2)+bx+c=0, find the v...

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  18. If alpha, beta are the roots of the equation ax^(2)+bx+c=0, find the v...

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  19. If alpha, beta are the roots of the equation ax^(2)+bx+c=0, find the v...

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  20. If alpha, beta are the roots of the equation ax^(2)+bx+c=0, find the v...

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  21. Find the values of m for which the following equations have equal root...

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