Question

2. Let a=7 ,d=3,n=8,then the value of a n is
a)25
b)27
c)20
d)28
​

Answer 1

$\huge{\blue{\boxed{\green{\underline{\orange{\mathbb{Question✩}}}}}}}$

a=7, d=3, n=8 find an term of A.P

a)25

b)27

c)20

d)28

$\bold{\huge\pink{\boxed{{{Answer (d)➺ 28}}}}}$

STEP BY STEP SOLUTION :-

$\huge \mathcal \color{maroon}{Given :-}$

$\\ a \: = 7 \\ d = 3 \: \: \\ n = 8 \:$

$\huge \mathcal \color{maroon}{To \: find :-}$

${}^{a}n = ?$

$\huge \mathcal \color{maroon}{Solution :-}$

${}^{a} n = a + (n - 1)d \\ (by \: putting \: the \: value \: of \: a,d \: and \: n) \\ ⟹7 + (8 - 1)3 \\ ⟹7 + (7 \times 3) \\ ⟹7 + 21 \: \: \: \: \: \: \\ ⟹an=28 \: \: \: \: \: \: \: \: \: \:$

$\huge \mathcal \color{maroon}{Information :- }$

$Here, \: \\ \: \: ➯ \: a=1st \: term \: of \: \: AP \\ ➯ \: d = common \: diffrence \\ ➯ \: n = number \: of \: terms \\ ➯ \: {}^{a} n = last \: term \\ ➯ \: formula \: used = a + (n - 1)d$

Answer 2

Hello !

Given:-

• a = 7,
• d = 3 and
• n = 8.

To find :-

• value of an.

Formula to be used :-

$\huge \fbox \blue{an=a+(n-1)d}$

Solution:-

$\implies$ an = 7 + (8-1)3

$\implies$ an = 7 + 7(3)

$\implies$ an = 7 + 21

$\implies$ an = 28.

hence, the value of an is 28.

option D is right