The sum of 20 terms of log2+log4+log8+..... is: a) 20log2 b) log20 c) 210log2 d) log2
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, =log2+2 log2+3 log2 +....... +20 log2
=log2 (1+2+3+4+.....+20)
=210 log2
=log2 (1+2+3+4+.....+20)
=210 log2
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