divinity8993 divinity8993
  • 24-01-2019
  • Mathematics
contestada

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

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dhiab
dhiab dhiab
  • 24-01-2019

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


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tramserran
tramserran tramserran
  • 24-01-2019

Answer:   1035

Step-by-step explanation:

[tex]\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[/tex]

Answer Link

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