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OpenStudy (anonymous):
The sum of the first n consecutive natural numbers is (n(n+1))/2. For example, 1+2+3+4=10=(4(4+1))/2. Find all values of n with the property that this sum lies between 150 and 200.
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OpenStudy (anonymous):
do u know the formula for sum of numbers in AP when number of terms n, first term and last term are given?
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