the sum of the
number of the series 9, 5,1 ........ to 100 terms is
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Answer:
S(100) = 100/2 [ 2*9 + ( 100 - 1) (-4)]
S 100 = 50 [ 18 - 396]
S 100 = 50 * ( - 378)
S 100 = - 18900
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