Q. 2 E4.2( 5 Votes )

Find:

the 15th term of the AP - 40, - 15, 10, 35,…

Answer :

Here, First term = a = - 40

Common difference = d = - 15 - (-40) = 25


To find = 15th term, n = 15


Using the formula for finding nth term of an A.P.,


an = a + (n - 1) × d


an = - 40 + (15 - 1) × (25)


an = - 40 + 14 × (25) = - 40 + 350 = 310


15th term of the given AP is 310.


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