Find the sum of 10+20+30+......+1000
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Answer:
The sum of 10+20+30+......+1000 is 50500
Step-by-step explanation:
10,20,30,....are in AP
a=10
d=10
aₙ=1000
a+(n-1)d=1000
10+10n-10=1000
10n=1000
n=100
S₁₀₀=50(2(10)+99(10))
=50(20+990)=50(1010)=50500
The sum of 10+20+30+......+1000 is 50500
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