Do you know the equation for "sum of geometric series"? If not please look up on your text book or do a Google search. Please come back and tell us if yo do not understand something.
Please show us what you have tried and exactly where you are stuck.
Please follow the rules of posting in this forum, as enunciated at:
If you do not know what a "geometric series" is, where did you get this problem? If you do, you should know that there is a standard formula for the suim of an infinite geometric series:
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