What is application of octal number hello what is octal deca number conversation application (965)8= ()2 
Is there any possible reason why this is posted under economics? Is the question $965_8 = x_2?$ If so, there is no answer because 965 is not a legitimate octal number? Or is the question $965_{10} = x_8?$ Or is the question "what is the practical use of octal notations?" 
I expalin your error in the question. In base of number the digit in presention of number can't be above than the base. So, 965 in octal can't be legitimate because of 9 (9 > 8 ) and in every base the numbers is lower than the base. More example: 1213 in base 2 isn't legitimate 1213 in base 4 is legitimate 555 in base 6 is legitimate 555 in base 5 isn't legitimate (the digit 5 = 5, and it need to be lower than). Understood? 
no what is use of octal number and hdeca numbrr in computer 
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It is for convience when you use numbers and instruction of computer. The use of them facilite the programming of computer program, to find error in the computer and to do instruction in Assembler. 
hello binary is used in circuit but where octal are used and deca are used 
In Pascal, Assembly, C, C++. 
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$101,110_2 = 56_8.$ How do I know that? $101_2 = 5_8 \text { and } 110_2 = 6_8.$ $1010,0001_2 = A1_{16}.$ How do I know that? $1010_2 = A_{16} \text { and } 0001_2 = 1_{16}.$ It is quicker and less error prone for humans to use octal and hexadecimal than to use binary. 
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