berggirls4 berggirls4
  • 01-08-2018
  • Mathematics
contestada

Which summation formula represents the series below?

Which summation formula represents the series below class=

Respuesta :

rejkjavik rejkjavik
  • 01-08-2018

we are given

[tex] 1+2+6+24 [/tex]

we can rewrite it as

[tex] 1+2*1+3*2*1+4*3*2*1 [/tex]

so, total number of terms is 4

now, we can find nth term

[tex] a_n=n! [/tex]

we can write it in sigma form

[tex] \sum _{n=1}^4\:n! [/tex]

we can also write it as

[tex] \sum _{n=2}^5\:(n-1)! [/tex]

so, option-A.........Answer

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