2log105 + log1036 - log109 =?
Solution
Correct Answer: Option A
2log105 + log1036 - log109
= log1052 + log1062- log1032
[ যেহেতু, plogkM = logkMp]
= log10 {(52×62)/32}
[যেহেতু, logkM + logkN = logk(MN), logkM – logkN = logk(M/N)]
[ যেহেতু, plogkM = logkMp]
= log10 {(52×62)/32}
[যেহেতু, logkM + logkN = logk(MN), logkM – logkN = logk(M/N)]
= log10{(25 × 36)/9}
= log10100
= log10102
= 2log1010
= 2.1 [logaa=1]
= 2
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