7+8+9+10+11+....+72+73. plz give me formula to solve
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Answered by
2
sn=n/2(a+an) ................
Answered by
4
u can use AP
a=7
d=1
l=73
first find the number of terms by
nth=a+(n-1)d
then use sum to f nth terms
snth=n/2(2a+(n-1)d
a=7
d=1
l=73
first find the number of terms by
nth=a+(n-1)d
then use sum to f nth terms
snth=n/2(2a+(n-1)d
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