find sum of all
natural integers between 500 and 1000 which arr divisible by 11
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First natural number divisible by 11 after 500 is 506
Natural number divisible by 11 before 1000 is 990
first term a=506
last term l=990
number of terms =54
sum of the terms = (54÷2)(506+990)
=27X1496
=40392
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