English
Gujarati
Basic of Logarithms
normal

यदि ${\log _{10}}3 = 0.477$, तो ${3^{40}}$ में अंको की संख्या है

A

$18$

B

$19$

C

$20$

D

$21$

(IIT-1992)

Solution

माना $y = {3^{40}}$

दोनों पक्षों का $\log $लेने पर, $\log \,y = \log {3^{40}}\,\, \Rightarrow \log \,\,y = 40\,\log 3$$ \Rightarrow \,\,\log \,y = 19.08$

$ y$  में अंको की संख्या $ = 19 + 1 = 20$

Standard 11
Mathematics

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