sum of series 497.3+495.3+493.7+.....+3.497
Hard to say. There is no common difference or ratio, and so few terms are given that it is hard to give a rule.
The first two end in .3
the next ends in .7
... and the last ends in .497
???
The first two end in .3
the next ends in .7
... and the last ends in .497
???