Wednesday, 12 September 2012

Series

the sum of the following series
3+4+8+9+13+14+18+19+... to 20 terms is
1)549
2)520
3)511
4)536
sol>
(3+4)+(8+9)+(13+14)+(18+19)+...=7+17+27+37+... 10 terms now easy for u.. 
 sum=n/2[2a+(n-1)d]
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