Question

find the 13th term of AP 9,12,25,18
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Answer 1

this is a not an A.P

Step-by-step explanation:

because the common difference is not a constant

the rule to form A.P is

in an A.P common difference is constant so it is an A.P

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Answer 2

Answer:

45.

Step-by-step explanation:

a=9

a2=12

d=a2 - a

=12 - 9

=3

a13=a + 12d

     =9 + 12(3)

     =9 + 36

     =45 Ans.