sum of 9,7,5,3,..to 19terms
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Answered by
4
a=9
d=-2
n=19
Sn=n/2{2a+(n-1)d}
=19/2{2×9+18(-2)}
=19/2(18-36)
=19/2×(-18)
=19×(-9)
=-171.
Hope it helps....
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