Question

7th term of an appointment is 8 more than it's 3rd term.if the sum of first and 19th term is 46.
Find it's common difference
Write it's first term
Which is it's 11th term

Answer 1

Step-by-step explanation:

a3=a+2d and a7=a+6d

according to the sum,

a+6d-(a+2d)=8

4d=8

d=2

now a19=a+18d

so a+a+18d=46

2a+18×2=46

2a=46-36=10

a=10÷2=5

so a11=a+10d

a11=5+10×2=5+20

a11=25