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Question

The number of integral solution to the system of equation a1+a2+a3+a4+a5=25 and a1+a2+a3=10 are

A
28+25
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B
210+25
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C
225+210
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D
Infinite
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Solution

The correct option is D Infinite
We have, a1+a2+a3+a4+a5=25..........(1)
and a1+a2+a3=10 .........(2)
By, (2)(1)
a4+a5=15 ....(3)
Let a4=x,a5=y
x+y=15.......(4)
Here x and y are integers.
So number of integral solution will be infinite, since we have one equation and two unknowns

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