S10=[ (a1+a10)*10] / 2 ⇒a10+a10=420/5⇒a1+a10=84⇒a10=51
Dar a10=a1+9r⇒a10=33+9r⇒9r=18⇒r=2
In asta consta rezolvarea :).
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S10=[ (a1+a10)*10] / 2 ⇒a10+a10=420/5⇒a1+a10=84⇒a10=51
Dar a10=a1+9r⇒a10=33+9r⇒9r=18⇒r=2
In asta consta rezolvarea :).