Q11 of 202 Page 10

Write the expression for the common difference of an A.P. whose first term is a and nth term is b.

The nth term of the A.P whose first term a1 and common difference is d is given by

an = a + (n–1) d


Here an is given as b


so b = a + (n–1) d


= d


⇒ d=


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