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Lauraa39
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Urgeeent!! Dau coroana si 50 de puncte!!​

Urgeeent Dau Coroana Si 50 De Puncte class=

Răspuns :

Slavitescudora

2/50 + 4/50 + 6/50 + ...... + 48/50 =

(2+4+6+.....+48)/50 = 2[(1+2+3+.....+24)]/50 = [(1+2+3+.....+24)]/25 = S/25

S ( suma lui Gauss ) = [(1+24)×24]/2 = 25×12 = 300

⇒ S/25 = 300/25 = 12

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