Question

9)
For an A.P. if tn=24,n=12,d=2, then what is the value of a?
(A) 2 (B) 1 (C) 12 (D) 24​

Answer 1

last term = a+(n-1)d

24=a+(12-1)2

24=a+22

a=2

Answer 2

Brief Understanding :-

AP is simply defined as the sequence of numbers in which each term obtained by adding a fixed number to the preceeding term for getting successive term

In an AP,

a is used to denote the first term of an AP

d is used to denote common difference

n is the number of terms of an AP

an is used to denote the total numbers of an AP

Solution :- $.$

Here,

tn = 24

n = 12

d = 2

By using tn formula

tn = a + ( n - 1 )d

Subsitute the required values,

24 = a + ( 12 - 1 )2

24 = a + 11 * 2

24 = a + 22

a = 24 - 22

a = 2

Hence, The value of a that is the first term of an AP is 2

Option A is your answer mate.