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3 years ago

Find the sum of the G.P,1+2+3+...+45

Mathematics

2 answers:

Colt1911 [192]3 years ago

8 0

Answer:

hello :

note : 1+2+3+.......+n = n(n+1)/2

Step-by-step explanation:

in this exercice : n = 45

1+2+3+...+45 = 45×46/2 = 1035

tankabanditka [31]3 years ago

6 0

Answer: 1035

Step-by-step explanation:

$\sum^{45}_{1}i\\\\\text{The sum of an arithmetic sequence is:}\ \dfrac{a_1+a_n}{2}\cdot n\\\\= \dfrac{1+45}{2}\cdot 45\\\\\\=\dfrac{46}{2}\cdot 45\\\\\\=23\cdot 45\\\\=1035$

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4 years ago

What is the equation of the line that passes through the points (–12, –8) and (–17, –16)?

horsena [70]

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Murljashka [212]

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