FInd the sum of all odd numbers between 100 and 200.
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101,103,105...........199
an = 199 a = 101 d= 2
an= a+ (n-1)d
199 = 101 +(n-1) 2
199-101 = (n-1)2
98/2 = n-1
49 +1 = n
so, n= 50
sn = n/2 (a+l)
= 50/ 2 (101+199)
= 25 x 300
= 7500
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