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S3=3+6+9+12+.......99rog rezolvare​

Răspuns :

S3 = 3 + 6 + 9 + 12 + ... + 99

S3 = 3 × ( 33 × 34 : 2 )

S3 = 3 × ( 1122 : 2 )

S3 = 3 × 561

S3 = 1683

S = 1683 : 3

S = 561