Verified Answer :

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Let us assume the common ratio to be = x
Then
(1 x) + (4 x) = 50
x + 4x = 50
5x = 50
x = 50/5
   = 10
So from the above deduction, we get the common ratio to be equal to 10
Then
The smallest number = 1 x
                                  = 1 10
                                  = 10

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