Oif the 21th term of an ap is25 find the sum of first .41 terms
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a +(21-1)d = 25
a+20d = 25
a=25 - 20d
now 41 term
a + 40 d =x
25 - 20d + 40d = x
25 + 40d = x
a+20d = 25
a=25 - 20d
now 41 term
a + 40 d =x
25 - 20d + 40d = x
25 + 40d = x
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