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Find the sum of the odd numbers between 0 and 50.

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We have First odd number is 1
Last odd number is 49
a = 1 an or I = 49 ,common difference d= 2.
an = a+(n-1)d
=1+(n-1)2 = 49
=1+2n-2 =49
=2n-1 =49
=25/2* 50
25 *25 = 625
therefore sum of all odd numbers between 0 to 50 is 625.

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