Evaluate 10+ 11+12++..........+25
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Answered by
10
This is an series of AP:
a=10,l=25,d=1,n=16
Sn = n/2[a+l]
= n(10+25)/2
= n(35/2)
= 17.5n
= 17.5×16
= 280.
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Answered by
1
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