Find the 78th term of the arithmetic sequence 14, 5, -4

High School · Sun Nov 14 2021

llm

Answered on Mon May 30 2022

Formula :

an = a + (n-1)d

Here,

a = 14

d = a2 - a1

= 5 -14

= -9

n = 78

So, a78 = 14 + (78-1)× -9

= 14 + 77× -9

= 14 -693

= -679

Hence, 78th term of arithmetic sequence is -679