Maths-
General
Easy

Question

Number of cyphers after decimal before a significant figure comes in open parentheses 5 over 3 close parentheses to the power of negative 100 end exponent is

  1. 21
  2. 22
  3. 23
  4. none

hintHint:

Here cypher means the number of zeroes that come before a significant number comes in a decimal figure. We need to solve the given problem using the formulas of logarithm.

The correct answer is: 22


    1 over 10 to the power of 22.2 end exponent
    Here, we have to find the number of cyphers.
    Firstly, we have given is,
    Let, A = open parentheses 5 over 3 close parentheses to the power of negative 100 end exponent 
    Taking log both sides to base 10, we have
    l o g subscript 10 space A equals negative 100 space space log subscript 10 space end subscript space open parentheses 5 over 3 close parentheses
    l o g subscript 10 space A equals negative 100 space left square bracket l o g subscript 10 5 minus log subscript 10 3 right square bracket
    We have log105 = 0.6990 and log103 = 0.4770
    Hence,
    log10⁡A= -100(0.699-0477)
    log10⁡A= -100(0.222)
    log10⁡A= - 22.2
    We know that loga b=x so we can write, a = bx ,
    A = 10-22.2
    A= 1/ 1022.2
    Therefore, the cypher number is 22.
    The correct answer is 22.

    In this question, we have to find the number of cyphers. We need to remember that the cypher number can be found from the logarithmic calculation but to find the actual value or to visualize it we need to remove the logarithm. Here, log105 = 0.6990 and log103 = 0.4770.

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