SOLUTION: Find the sum of the infinite series {{{ 1 + 2 + 3 + 4 + ... + r -1 }}} divided by r! (factorial of r) where r belongs to infinite set {2, 3, 4, 5, .....}.
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-> SOLUTION: Find the sum of the infinite series {{{ 1 + 2 + 3 + 4 + ... + r -1 }}} divided by r! (factorial of r) where r belongs to infinite set {2, 3, 4, 5, .....}.
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Question 1184295: Find the sum of the infinite series divided by r! (factorial of r) where r belongs to infinite set {2, 3, 4, 5, .....}. Found 2 solutions by ikleyn, robertb:Answer by ikleyn(52905) (Show Source):
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