Question 1181281
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The sequence {10, 15, 20, ..., 95} is an AP with {{{a[1]=10}}}, {{{ n = 18}}}, and common difference {{{d=5}}} (but we don't need d to solve this problem):

Sum = S = {{{ n((a[1]+a[n])/2) = 18*((10+95)/2) = 945 }}}