6247₈
\(\overset { 6 }{ \underset { 110 }{ \downarrow } } \) \(\overset { 2 }{ \underset { 010 }{ \downarrow } } \) \(\overset { 4 }{ \underset { 100 }{ \downarrow } } \) \(\overset { 7 }{ \underset { 111 }{ \downarrow } } \)
6247₈ = 110010100111₂

145₈
= \(\overset { 1 }{ \underset { 1 }{ \downarrow } } \) \(\overset { 4 }{ \underset { 100 }{ \downarrow } } \) \(\overset { 5 }{ \underset { 101 }{ \downarrow } } \)
= 145₈ = 1100101₂

(i) ASCII: American Standard Code for Information Interchange (ASCII).
(ii) BCD : Binary Coded Decimal (BCD)
(iii) EBCDIC: Extended Binary Coded Decimal Interchange Code (EBCDIC)
(i) ASCll:   American Standard Code for Information Interchange (ASCII) is a 7-bit code, which means that only 128 (27) characters can be represented. However, manufacturers have added an eighth bit to this coding scheme with which it is possible to represent 256 characters. This 8-bit coding scheme is referred to as anS-bit American standard code for information interchange. The symbolic representation of letter A using this scheme is 1000001₂(65_1O). It is a character encoding standard developed several decades ago to provide a standard way for digital machines to encode characters. The ASCII code provides a mechanism for encoding alphabetic characters, numeric digits, and punctuation marks.
(ii) BCD: Binary Coded Decimal is a 4-bit code used to represent the numeric data alone. For  example, a number like 9 can be represented using Binary Coded Decimal as 10012 . Binary Coded Decimal is mostly used in simple electronic devices like calculators and microwaves. This is because it makes it easier to process and display individual numbers on their Liquid Crystal Display (LCD) screens. A Standard Binary Coded Decimal, an enhanced format of Binary Coded Decimal, is a 6-bit representation scheme which can represent non-numeric characters. This allows 64 characters to be represented.
(iii) EBCDIC: Extended Binary Coded Decimal Interchange Code (EBCDIC) is an 8-bit character-coding .scheme used primarily on IBM computers. A total of 256 (28) characters can"be coded using this scheme.

A, B, C, D, G, H, I, L, M, N are presents 0,1,2,3,4, 5, 6, 7, 8, 9 respectively of decimal number system  (base 10) so, (INDIAN)_IO = (693609)₁₀
To find its hexadecimal equivalent

Thus (INDIAN)₁₀ = (693609)₁₀ = (A9569)₁₆

The NOR gate circuit is an OR gate followed by an inverter. Its output is "true" if both inputs are "false" Otherwise, the output is "false". In other words, the only way to get '1 ' as output is to have both inputs ' 0 '. Other wise the output is 0. The logic circuit of the NOR gate is

The output of NOR gate is
C = \(\overline { \left( A+B \right) } \)
Read this as "C equals NOT of A OR B" or "C equals the complement of A OR B".
For example if both the input are 0
C = \(\left( 0+0 \right) \) = \(\bar { 0 } \) = 1
The truth table for NOR gate is

NAND Gate:
The NAND gate operates an AND gate followed by a NOT gate. It acts in the manner of the logical operation "AND" followed by inversion. The output is "false" if both inputs are "true", otherwise,' the output is "true". In other words the output of the NAND gate is 0 if and only if both the inputs are 1, otherwise the output is 1. The logic circuit of NAND gate is

The logical Symbol of the NAND gate is

The output of the NAND gate is
C = \(\overline { \left( A.B \right) } \)
Read this as "C" equals NOT of A AND B" or "e" equals the complement of A AND B".
For example, if both the inputs are 1
C = \(\overline { \left( 1.1 \right) } \) = \(\bar { 1 } \) = 0
the truth table for NAND gate is