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यदि `log_(30) 3 = a` तथा `log_(30)5 = b` हो , तब `log_(30)8` का मान बताइए?A. 3 (1 + a + b)B. 3 (1 - a+b)C. 3(1 + a - b)D. 3(1 -a -b) |
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Answer» Correct Answer - D दिया है , `log_(30) 3 = a` तथा `log_(30) 5 = b` अब , ` log_(30) 8 = 3 log_(30)(2 xx 15/15)` ` = 3[ 1 - {log_(30) 5 + log_(30) 3}]` ` = 3 (1 - a - b)` |
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