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91+92+....+199+200 ( suma lui gauss)

Răspuns :

91 + 92 + ....... + 199 + 200 = 16 005

→ stabilim cati termeni are suma

( 200 - 91 ) + 1 = 109 + 1 = 110 termeni are suma  cu ratia 1

= 110 × ( 91 + 200 ) / 2 =

= 55 × 291 =

= 16 005