find the sum of ...11+13+15+.....+97+99
raju79:
plz help
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there are total 45 no.s .
we can see that the sum of the no. from back and front makes 120.
this pair is in total 23 and the no. 55 is unpaired.
.•. sum = (23×120)+55 = 2760+55 = 2815
I hope it helped you...
^_^
we can see that the sum of the no. from back and front makes 120.
this pair is in total 23 and the no. 55 is unpaired.
.•. sum = (23×120)+55 = 2760+55 = 2815
I hope it helped you...
^_^
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