Question

The 3rd and 4th terms of an arithmetic sequence are 13 and 18, respectively.What is the 50th term of the sequence?

Answer 1

in an arithmetic sequence, the nth term is the first term +(n-1)times the difference

the difference between the 3rd and 4th term is 18-13=5, so d=5

now we need to find out the first term: 13=a1+(3-1)d => a1=3

the 50th term is a1+(50-1)d=3+49*5=248

the

Explanation: