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dear sir/madam,how to solve this problem?please help. The number of positive integral solutions of XYZT=210 are A)256 b)64 c)24 d)120
The number of positive integral solutions of XYZT=210 are
A)256
b)64
c)24
d)120
Dear h v
factorise 210 = 7*5*3*2
XYZT =210
7 can be assign to any X,Y,Z,T in = 4 ways
similerly 5 can be assign to any X,Y,Z,T in = 4 ways
3 can be assign to any X,Y,Z,T in = 4 ways
2 can be assign to any X,Y,Z,T in = 4 ways
so total ways = 4*4*4*4 =256
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thanks for the answer
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