$$ \ begin {align} & 1. \ qquad \ sum_ {n = 1} ^ {\ infty} {2 {^ {2n +1}} \ over 5 ^ n} \ end {align} $$ `

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$$ \ begin {align} & 1. \ qquad \ sum_ {n = 1} ^ {\ infty} {2 {^ {2n +1}} \ over 5 ^ n} \ end {align} $$ `

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