Consider the following AP sequence: $1, a, b, c, 9$ . The common difference of this A.P is $a$ .

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Solution

The correct option is B
3

$a$ is the second term of the A.P.

Let, $d$ be the common difference.

second term = first term + common difference

$\Rightarrow a = 1 + d$

$\Rightarrow d = a - 1$

Hence, $a$ is not the common difference.

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Consider the following AP sequence:1, a, b, c, 9. The common difference of this A.P is a.

The correct option is B 3 a is the second term of the A.P. Let, d be the common difference. second term = first term + common difference ⇒a=1+d ⇒d=a−1 Hence, a is not the common difference.

Consider the following AP sequence: $1, a, b, c, 9$ . The common difference of this A.P is $a$ .

The correct option is B
3

$a$ is the second term of the A.P.

Let, $d$ be the common difference.

second term = first term + common difference

$\Rightarrow a = 1 + d$

$\Rightarrow d = a - 1$

Hence, $a$ is not the common difference.