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The value of 0·2log514+18+116+ is 

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a
4
b
log 4
c
log 2
d
none of these

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detailed solution

Correct option is A

We have,14+18+116+⋯=1/41−1/2=12Hence,0.2log5⁡ 14+18+116+⋯=0.2log5⁡ 12                                           =15log5⁡12                                          =5−12log⁡512                                         =(5)−2log5⁡12                                         =(5)log5⁡4                                         =4


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