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a = 1 500; n = 12;d = 750
Sn = $\frac{n}{2}$(2a + (n - 1)d
= $\frac{12}{2}$ 2( 1 500) + 11 x 750)
= 6(3 000 + 8 250)
= 6 x 11250 = sh 67 500
johnmulu answered the question on March 7, 2017 at 07:29
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