Question

Identify the 42nd term of an arithmetic sequence where a1 = -12 and a27 = 66.
1) 70

2) 72

3) 111

4) 114

Answer 1

@Here_to_Help15

Answer 2

@ganeshie8

Answer 3

well you need to find the common difference

a term in an arithmetic sequence is found using

\[a_{n} = a_{1} + (n -1) \times d\]

you know the 27th term so n = 27 and you know the 1st term so

\[66 = -12 + (27 - 1) d\]

you need to solve for d

Answer 4

Thanks Hun ! God bless you !