Предмет: Математика, автор: anyachemeris1

Знайдіть суму всіх натуральних чисел, які кратні 6 і менші від 250

Ответы

Автор ответа: nafanya2014

0

a₁=6
a₂=12
d=a₂-a₁=12-6=6

$a_n=246 textless 250$

246=6+6(n-1)
6(n-1)=240
n-1=40
n=41

S₄₁=(6+246)·41/2=5986

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