If the first and the last terms of an arithmetic series are 10 and 62, show that the sum of the series varies directly as the number of terms.
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hey..
sn = n/2 [a + an]
sn = n/2 [10 + 62]
sn = n/2 [72]
sn = 36n
Therefore the sum varies directly as the number of terms
sn = n/2 [a + an]
sn = n/2 [10 + 62]
sn = n/2 [72]
sn = 36n
Therefore the sum varies directly as the number of terms
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