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Question: Write the infinite series in sigma notation:
0.1 + 0.01 + 0.001 + 0.0001 + ...



A ) IV
B ) I
C ) III
D ) II
E ) V

Steps to derive

1 0.1 + 0.01 + 0.001 + 0.0001 + ...
 [Infinite series.]

2 = ∑n=1∞ (0.1)n



Hence the right answer is Option B

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