Question

Find whether 55 is a term of the AP: 7, 10, 13,--- or not. If yes, find which term it is.​

Answer 1

Answer:

a=7

d=3

therefore, ATQ; An=55

a+(n-1)d=55

7+(n-1)3=55

(n-1)3=55-7

(n-1)=48/3

n-1=16

=> n=17

therefore, the 17th term is 55

hope it will help u

Answer 2

Answer:

an=a+(n-1)d

d=10-7=3

55=7+(n-1)*3

55=7+3n-3

55=4+3n

55-4=3n

51=3n

51/3=n

17=n

therefore the 17th term of AP is 55

hope its helpful

have a good day