Find the sum of all integers between 101 and 999
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a=101
d=1
n=999
Sn=n/2(2a+(n-1)d)
=999/2(2×101+(999-1)×1)
=999/2(202+998×1)
=999/2×2(101+499)
=999×600
=599400
d=1
n=999
Sn=n/2(2a+(n-1)d)
=999/2(2×101+(999-1)×1)
=999/2(202+998×1)
=999/2×2(101+499)
=999×600
=599400
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