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Byju's Answer
Standard X
Mathematics
Common Difference
If the n th t...
Question
If the nth term of an AP is (7 − 4n), then its common difference is
(a) 4
(b) −4
(c) 3
(d) −3
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Solution
(b) -4
Here, T
n
= 7 - 4n
Then T
1
= 7 - 4 ⨯ 1 = 3
Also, T
2
= 7 - 4 ⨯ 2 = -1
∴ d = T
2
- T
1
= -1 - 3 = -4
Hence, the common difference is -4.
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