Is 68 a term of the A.P. 
?
a = 7, d = 3
An= a + (n – 1) d
68= 7 + (n – 1) 3
68= 4 + 3n
3n = 64
Since, 64 is not divisible by 3
Therefore, 68 isn’t the term of the given A.P.
3
Is 68 a term of the A.P. ?
a = 7, d = 3
An= a + (n – 1) d
68= 7 + (n – 1) 3
68= 4 + 3n
3n = 64
Since, 64 is not divisible by 3
Therefore, 68 isn’t the term of the given A.P.