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January 30, 2015

January 30, 2015

Posted by **Joyce** on Sunday, August 19, 2012 at 12:40pm.

- Math -
**animesh kumar**, Sunday, August 19, 2012 at 1:05pm1 + 3 + 5 +........2n-1....

1st term = 1

40th term = 2*40-1 = 79

arith metic progression

s = n/2(a1+an)

= 40/2(1+79) = 1600

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