1.

The sum of all multiples of 7 lying between 500 and 1000

Answer»

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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