The common difference of an A.P. in which a15 – a11 = 48, is

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Solution

Q.
The common difference of an A.P. in which a15 – a11 = 48, is

1 12

2 16

3 –12

4 –16

Ans.
(1)

$a_{15} - a_{11} = 48$

$\Rightarrow a + 14 d - a - 10 d = 48$

$\Rightarrow 4 d = 48 \Rightarrow d = 12$

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