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AveGali [126]
3 years ago
9

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

<u>Step-by-step explanation:</u>

<u>\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</u>

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