The sum of all multiples of 7 lying between 500 and 1000
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Answer:
53928
Step-by-step explanation:
all multiples of 7 lying between 500 and 1000 is
504,511,518,....994
the above series is in Arthimetic progression with common difference 7,no of terms,n=72
Therefore Sn=n/2[a+l]
Sn= (72/2)[504+994];
=36*1498
=53928
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