Question

find tn of the ap 4,9,14,...

Answer 1

here
A=4
d=5
tn=a+(n-1)d
tn=4+(n-1)5
tn=4+5n-5
tn=5n-1

Answer 2

tn = a + (n-1) × d

Here,
a= 4
d= 9-4 = 5

tn = 4+(n-1)5
= 4 +5n-5
tn = 5n-1

hope it helped,
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