Question

The 7th term and 17th term of an A.P. are 24 & 54 respectively find the 12th term of this A.P.

Answer 1

Answer:

A7= 24

A7= a+6d

24= a+6d

A17= 54

A17 = a+16d

54= a+16d

subtract A17 from A7

We will get ..

54-24 = a+16d- a-6d

30= 10d

d = 3

24= a+6(3)

24= a+18

24-18= a

a= 6

now A12= a+11d

A12= 6+11(3)

= 6+33

= 39

Therefore the 12th term of this AP is 39

Answer 2

Answer:

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