Thus :
Thus :
1.an=n + 52.an-4n-13.an-2n24.an-5-2n5.an-3-5n
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To find the the expression that gives the value of 
we are going to proceed as follows:
equation (1)
equation (1)
Step 1. solve for
in equation (2)
equation (3)
Step 3. Replace equation (3) in equation (1) and solve for
We can conclude that the expression that gives the value of is:
Step 1. solve for
Step 3. Replace equation (3) in equation (1) and solve for
We can conclude that the expression that gives the value of
