Find the 20thterm from the last term of the ap3,8,13,....,253
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Hi Mate!!!
an = a + ( n- 1 ) d
an is nth term , a is ist term ,d is common difference and n is no. of terms
an = 253 d = 5 a = 3
=>. n = 51
=>. Sum of last 20th terms = Sum of 51th terms - sum of 31th terms
=>. 4410
an = a + ( n- 1 ) d
an is nth term , a is ist term ,d is common difference and n is no. of terms
an = 253 d = 5 a = 3
=>. n = 51
=>. Sum of last 20th terms = Sum of 51th terms - sum of 31th terms
=>. 4410
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this is the answer........
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