How do you find the first term of the arithmetic sequence having the data given #a_n= 48#, #S_n= 546#, n = 26?

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Answer 1 · 2016-02-22T08:43:08

First term#" " "a_1=-6#

The given data: #a_n=48# and #S_n=546# and #n=26#

Formulas for the Sum of n terms of an Arithmetic Sequence

#Sn=n/2(a_1+a_n)#

#546=26/2(a_1+48)#

solving for #a_1#

#a_1=-6#

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