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arithmetic sequence

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find the sum of the first 30 terms of the arithmetic sequence 6,11,16,21......

 

asked Nov 22, 2013 in ALGEBRA 1 by skylar Apprentice

1 Answer

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Arihemetic sequence S n = n/2[2a+(n-1)d]

Here d is common difference, a is first term

d = t2-t1 = 11-6 = 5

 a = 6,d = 5

and n =30

S 30 =30/2(2*6+(30-1)5 )

= 15(12+145)

= 15*157

= 2355

answered Nov 26, 2013 by william Mentor

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