Question

find the 7th term of an AP 24,21,18...​

Answer 1

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Answer 2

The 7th term of an A.P.($a_{7}$) = 6

Step-by-step explanation:

The given AP are:

24, 21, 18, ...​

Here, first term (a) = 24, common difference (d) = 21 - 24 = - 3

and n = 11

To find, the 7th term of an A.P.($a_{7}$) = ?

We know that,

The nth term of an A.P.,

$a_{n}$ = a + (n - 1)d

∴ The 7th term of an A.P.($a_{7}$)

= 24 + (7 -1)(-3)

= 24 + (6)(-3)

= 24 - 18

= 6

∴ The 7th term of an A.P.($a_{7}$) = 6