number of possibilities

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A linear equation in four variables equals 40. ( let the variables be p,q,r and s). the coefficients of p,q,r and s can be either -1 , 1 or zero. Also the values of p,q,r and s lies between -40 and 40, both included. How many different s...
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A linear equation in four variables equals 40. ( let the variables be p,q,r and s). the coefficients of p,q,r and s can be either -1 , 1 or zero.

Also the values of p,q,r and s lies between -40 and 40, both included.

How many different solution of such a equation exists.

Commenting on this post has been disabled by the moderator.