3,15,35,.....,99,143
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...........=63
bcoz,3+12=15;12+8=20
15+20=35;20+8=28
35+28=63;28+8=36
63+36=99......and so on
bcoz,3+12=15;12+8=20
15+20=35;20+8=28
35+28=63;28+8=36
63+36=99......and so on
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