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Q48. The value of the series ∑r=2∞ (1 + 2 + 3 + ... + (r−1)) / r! is equal to:

Mathematics — NUST Mock By IBAGRADS 4 — Question 48 of 200

A. e
B. 2e
C. e/2
D. 3e/2

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The value of the series ∑r=2∞ (1 + 2 + 3 + ..... | Mathematics MCQ #48 | Examora | Examora