complete the series 9,27,54,90,135
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9x1 = 9
9x3=27. (gape of 2)
9x6=56 (gape of 3)
9x10=90(gape of 4)
9x15=135(gape of 5)
so 9x21=182 (gape of 6)
gape is on number which is multiplied with 9
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