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One useful way of defining sequences is ...

One useful way of defining sequences is by a recursion
relation. Many recurrence relations can be transformed
to some know sequences, say GP or sometimes nth
term can be found by algebraic jugglery
If
'a_(1)' = 1, `a_(n) - a_(n-1) = 1` for every positive integer greater
than 1, then `a_(1) + a_(2) + a_(3) + ...a_(100)` rquals

A

`5000 .a_(1)`

B

`5050.a_(1)`

C

`5051 .a_(1)`

D

`5052 . a_(2)`

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