Odd Number (विषम संख्या)

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 A natural number that is not exactly divisible by 2 is called an odd number.
That is, one of the 1, 3, 5, 7, 9 comes at the end of the odd number.
For example:- 1 , 3 , 5 , 7 , 9 , 11 , 13 , 15 , 17 , 19 , ............. 31 , 33 , .......... ∞

• The smallest odd number is " 1 ".
• The largest odd number is "∞ ".

• The number which has any digit out of 1, 3, 5, 7, 9 at the unit place, then that number is called an odd number.

• Sum of first n odd numbers = n^ 2
1 + 3 + 5 + 7 + 9 + 11 + 13 + 15 + 17  + 19   = ? Sum = n^2         =  10^2         = 100