find the sum of all odd integers btw 150&275
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a= 151 d=2 , an = 273
Sn= n/2{2a+(n-1)d}
= n/2 {302+(n-1) 2}
= n/2 {300 +2n }
= n/2 (300+2n)
Sn = 300n+2n² / 2
An= a+(n-1)d
273 = 151 +2n-2
273 = 149 +2n
124= 2n
n= 62
put n in An
Sn= 300×62 + 2×62² / 2
= 26288
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