...........,....................13 question plzz
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Sn=n/2(a+l)
Sn=18/2(30+50)
Sn=720
Sn=18/2(30+50)
Sn=720
sprao534:
wrong answer
yes
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heya mate !!!
here's your answer....
#Mumbaikar_here
here's your answer....
#Mumbaikar_here
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the series is 1+3+5+7...
the terms between 30 and 50 are 31 +33+35+........+49.those are only 10 terms. sum of 10 terms =10/2[first term +last term] =5(80)=400
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