AZEEM

• Feb 16th, 2007

 

1,3,5,7,.......55( since given 28 numbers ..)

or formula::: tn=a+(n-1)d.....since n=28 and d=2 ..substitute tn=55

sum of odd terms formula...sum=n/2[2a+(n-1)d]....sum=784

even terms ...2+4+6+8+10=30

answer::784+30===814...

 

thank u