Q.

Let A=aij,aijZ[0,4],1i,j2. The number of matrices A such that the sum of all entries is a prime number p(2,13) is _____.

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answer is 204.

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Detailed Solution

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p can be 3,5,7,11
a+b+c+d=3,a,b,c,d{0,1,2,3,4}
coefficient of x3 in 1+x+x2+x3+x44=1x54(1x)4
=14C1x5+4C2x101+4C1+5C2x2+6C3x3+7C4x4+=6C3=20
If a+b+c+d=5 coefficient of x5 in 1+x++x44=8C54.1=52
If a+b+c+d=7 coefficient of x7 in 1+x++x44=10C74.5C2=12040
a+b+c+d=11coefficient of x11 in 
1+x+x2++x44=14C114.9C6+4C24C1=364336+24
Total matrices =20+52+80+52=204

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