Question

 In an AP, if d = -1, n = 4 and an = 24, the value of a is ​

Answer 1

Answer:

A=27

Step-by-step explanation:

An=a+(n-1)d

GIVEN

An=24

n=4

d=-1

SOL

An=a+(n-1)d

24=a+(4-1)-1

24=a-3

24+3=a

27=a

Hope it will help

Answer 2

Solution:-

Given:-

$\rm \: A_n = 24$

$\rm \: no \: of \: term(n) = 4$

$\rm \: common \: difference(d) = - 1$

$\rm \: first \: term \: (a) = x$

Formula

$\boxed{ \green{\rm \: A_n = a \: + (n - 1)d}}$

put the value on formula

$\rm \: 24 = a + (4 - 1) \times - 1$

$\rm \: 24 = a + 3 \times - 1$

$\rm \: 24 = a - 3$

$\rm \:a = 24 + 3$

$\rm \: a = 27$

First term(a) of AP is 27