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Question -

The 26th, 11th and last term of an A.P. are 0, 3 and – 1/5 , respectively. Find the common difference and the number of terms. [NCERT Exemplar]



Answer -

Let the first term, common difference and number of terms of an A.P. are a, d and n, respectively.
We know that, if last term of an A.P. is known, then
l = a + (n – 1) d ……(i)
and nth term of an A.P is

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