Find the sum of the first 1000 positive integers

1.	Find the sum of the first 1000 positive integers
Answer» 500500 Sorry, by mistake next question about \'GUT\' is answered here.\xa0\xa0\xa0\xa0\xa0\xa0\xa0 {tex}\\eqalign{ & s = {n \\over 2}\\left[ {2a + (n - 1)d} \\right] \\cr & a = 1,d = 1,n = 1000 \\cr & s = {{1000} \\over 2}\\left[ {2 \\times 1 + (1000 - 1)1} \\right] \\cr & s = 500(1001) \\cr & s = 500500 \\cr} {/tex}

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