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If L=limn1+311+321+341+38 1+32n,  then 

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a
L=23
b
L=32
c
L=1
d
L=2

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detailed solution

Correct option is B

1−3−1L=limn→∞ 1−3−11+3−11+3−21+3−4…1+3−2n 23L=limn→∞ 1−3−21+3−21+3−4…1+3−2n=limn→∞ 1−3−221+3−4…1+3−2n=limn→∞ 1−3−2n+1=1⇒L=3/2


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