If log10 2 = 0.3010 and log10 3 = 0.4771, then the value of log10 72 =
1.8572
0.8572
0.5872
1.5872
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Given,
⇒ log10 72
⇒ log10 (9 × 8)
⇒ log10 9 + log10 8
⇒ log10 32 + log10 2 3
⇒ 2log10 3 + 3log10 2
⇒ 2(0.4771) + 3(0.3010)
⇒ 0.9542 + 0.9030
⇒ 1.8572
Hence, option 1 is the correct option.
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If log10 2 = 0.3, then log10 8 =
0.9
0.6
1.2
none of these
Assertion (A): log (2 + 3 + 4) = log 2 + log 3 + log 4
Reason (R): log x x = 0
A is true, R is false
A is false, R is true
Both A and R are true
Both A and R are false