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Find the four numbers in A.P., whose sum...

Find the four numbers in A.P., whose sum is 50 and in which the greatest number Is 4 times the least.

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Let the 4 numbers be a−3d,a−d,a+d,a+3d then
`=> a−3d+a−d+a+d+a+3d=50`
`=> 4a=50`
` a=25/2`
And,
...
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