html5 - Need to get different Grey color shade randomly using jquery -

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I am working on the HTML5 pie chart. For each of those values, I need different gray colors. I have n numbers, so this is not stable, can anyone help me on it so that I can generate a random gray color shadow code.

code like you: 

  var a = Math.random ( ) * 254; Var B = Math. Floor (A / 8) * 8; $ (". Greybox") CSS ("background-color", "RGB (" + B + "," + B + "," + B + ")");

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