50.
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100.
The sum of the first 50 whole numbers is 1,225.
sum of n natural number is n(n+1)/2 first 50 number sum is 50(50+1)/2 = 1275
The sum of the numbers between 51 and 150 is equal to 10050 - or 50 x 201 - as there are 50 lots of 201 in the sum.
the sum of first 50 consecutive odd numbers is 9801