Answers

2015-06-10T17:29:46+05:30
A = 5 , l = 45 , Sn = 400. , first use the formula Sn = n/2(a+l) You will get the value of n and then use the formula of an = a + ( n- 1 ) d. Here an = 45 and you will get the value of d.
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