Question

If the nth term of an arithmetic progres-
sion a = 24 - 3n, then it's 2nd term is
(a) 18 (b) 15 (c) 0 (d) 2​

Answer 1

Answer:

18

Explanation:

plug in 2 in place of n

a = 24-3(2)

a = 24 -6

a = 18

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Answer 2

Answer:

a_2 =  18.

b. option is correct.

Explanation:

Given :

n term of A.P.

= > a_n = 24 - 3 n

We are asked to find second terms :

Putting n = 2 we get :

= > a_2 = 24 - 6

= > a_2 = 18 .

Therefore , second term of A.P. is 18.

Some important A.P.  formula are as :

t_n = a + ( n - 1 )  d

d = t_2 - t_1

S_n = n / 2 ( 2 a + ( n - 1 ) d )

S_n = n / 2 ( a + l )