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  1. Find the number of digits in 810 ? (Given that log10 2 = 0.3010)
    1. 19
    2. 20
    3. 17
    4. 10
Correct Option: D

810 = (23)10
∴ Required answer = [30 log10 2 + 1]
= [30 x 0.3010] + 1
= 9.03 + 1
= 9 + 1
= 10


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