Solution
$$1\times1+2 = 1+2 = 3$$
$$3\times2+3 = 6+3 = 9$$
$$9\times3+4 = 27+4 = 31$$
$$31\times4+5 = 124+5 = 129$$
$$129\times5+6 = 645+6 = 651$$
Hence 651 will come in place of blank to complete the series.
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