Limiting an integer in a random matrix

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Aj
Aj 2014-1-29
评论： José-Luis 2014-1-29
Hi, I want to make a 10 x 10 matrix with values either 1 or 2 but i only want 17 "2's" randomly placed together in 5 separate groups and the rest of the matrix to be "1's".
I was wondering how I should approach this.
thanks

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