If the first term of an A.P. is \( a \) and \( n^{\text {th }} \) term is \( b \), then its comm...

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If the first term of an A.P. is \( a \) and \( n^{\text {th }} \) term is \( b \), then its common difference is
W.
(a) \( \frac{b-a}{n+1} \)
(b) \( \frac{b-a}{n-1} \)
(c) \( \frac{b-a}{n} \)
(d) \( \frac{b+a}{n-1} \)
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