calvinrichardsp9ytqt calvinrichardsp9ytqt
  • 07-06-2018
  • Mathematics
contestada

Find the s10 for series 2+7+12+17+

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cchikoo
cchikoo cchikoo
  • 07-06-2018
sn=n/2(2a+(n-1)d)
n=10  a=2  d=5

s10=10/2(2*2+(10-1)5)
     =5(4+9*5)
     =5(4+45)
     =5(49)
     =245

answer should be 245.

hope this helps!
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