2025 · Q54
How many digits are there in 6^25? (It is given that log10(2) = 0.3010 and log10(3) = 0.4771)
General Mental Ability, Quantitative Aptitude and StatisticsLogarithms
- A20
- B21
- C22
- D23
Explanation
log10(6^25) = 25 x log10(6) = 25 x (log10 2 + log10 3) = 25 x (0.3010 + 0.4771) = 25 x 0.7781 = 19.4525. The number of digits is the characteristic plus one, i.e. 19 + 1 = 20.