Find the sum of first 15 multiples of 8.
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If Sn denotes the sum of first n terms of an A.P., prove that S30 = 3(S20 - S10).
Find the sum of first positive 1000 integers.
Find the sum of all two digit natural numbers which are divisible by 4.
Find the sum of all natural numbers between 100 and 200 which are divisible by 4.