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mathmath333
 one year ago
On a board having 18 rows and 16 columns ,find the number
of rectangles ?
mathmath333
 one year ago
On a board having 18 rows and 16 columns ,find the number of rectangles ?

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mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0\(\large \color{black}{\begin{align} & \normalsize \text{ On a board having 18 rows and 16 columns ,find the number}\hspace{.33em}\\~\\ & \normalsize \text{ of rectangles ?}\hspace{.33em}\\~\\ \end{align}}\)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.1theres a formula to find it :D number of rectangles in an m x n grid can be given by  \[\frac{ m(m+1)n(n+1) }{ 4 }\]

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0no i want methos i cant remeber formula

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.1ok then try finding out the solution this way How many ways can I draw two horizontal lines and two vertical lines through an array of (m+1) by (n+1) dots?

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.1(Think of the dots formed at the corners of the little squares within the rectangle)

imqwerty
 one year ago
Best ResponseYou've already chosen the best response.1The two horizontal lines can be drawn C(m+1,2) ways, and the two vertical lines can be drawn C(n+1,2) ways, so the total number of rectangles within an m x n rectangle isC(m+1,2) C(n+1,2)

mathmath333
 one year ago
Best ResponseYou've already chosen the best response.0m+1C2*n+1C2 is correct ?
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