Question

A Given
AP
is
1, 7, 13, 19,
then t18 = ?​

Answer 1

Answer:

103

Step-by-step explanation:

Here,

a=1

d=7-1=6

We know that,

tn=a+(n-1)d

Hence,

t18=1+(17*6)

=1+102

=103

Answer 2

Answer:

103

Step-by-step explanation:

here a=1

t2=7

t3=13

common difference=t3-t2 and t2-t1

13-7 and 7-1

6and6

common difference=6

now,

t 18 =a +(n-1)×d

= 1+(18-1)×6

=1+17×6

=1 +102

=103