Question

Which term of the AP 1;4;7 ...is55

Answer 1

Answer:

19th term is 55.

Step-by-step explanation:

AP=1,4,7

d=4-1=3

an=55

an=a+(n-1) d

55=1+(n-1)3

54=3n-3

57=3n

$n = \frac{57}{3}$

n=19