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Question Number 91850 by Power last updated on 03/May/20
Commented by mr W last updated on 03/May/20
youareback!thesamequestionsseemtobebacktoo...
=a11−q=11+12=23
Commented by mathmax by abdo last updated on 03/May/20
S=∑n=1∞(−1)n−1×12n−1=∑n=0∞(−1)n2n=∑n=0∞(−12)n=11−(−12)=132=23
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