2 votes 2 votes If log 2= 0.30103, the number of digits in 2^64 is : a.18 b.19 c.20 d.21 Quantitative Aptitude logarithms + – shaz asked Feb 23, 2019 shaz 2.4k views answer comment Share Follow See 1 comment See all 1 1 comment reply Meet2698 commented Feb 23, 2019 reply Follow Share First of all, $\log_{10}2$=0.30103 and not 0.030103 Let n = 2^64 The number of digits in n is given by floor($\log_{10}n$) +1 $\log_{10}n$ = 64$\log_{10}2$ = 64*(0.30103) =19.26592 Therefore number of digits in 2^64 = 1+floor(19.26592) = 20 Refer this : https://www.youtube.com/watch?v=kWndpHMpUlY 1 votes 1 votes Please log in or register to add a comment.