Question

Find whether 55 is a term of A.P 7 ,10,13. or not, if yes find which term or is?​

Answer 1

Step-by-step explanation:

let 55 be nth term of ap an =55

an=a+(n-1)d

here a =7,d=10-7=3

so 55=7+(n-1)3

n-1 =16

n=17

yes it is 17 th term of ap

Answer 2

Answer:

a= 7

d= a2-a1

= 10-7

= 3

let 55 be the term of A.p

55= a+(n-1)d ( a(n)= a +(n-1)d )

55= 7+(n-1)3

55-7= (n-1)3

48=(n-1)3

48/3= n-1

16= n-1

16+1= n

17= n

yes, 55 is a 17th term of A.p