Question

The nth term of an AP is 7 - 4n. Find its common difference.

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Answer 1

$<b>Answer :</b>$

- 4



$<b>Step-by-step explaination :</b>$

an 7 - 4n

Put n = 1

a1 = 7 - 4 ( 1 )

a1 = 7 - 4

$<u>a1 = 3</u>$

Put n = 2

a2 = 7 - 4 ( 2 )

a2 = 7 - 8

$<u>a2 = - 1</u>$

Common Difference, d –

= a2 - a1

= - 1 - 3

= $<b>- 4</b>$

Answer 2

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