विलुप्त सं. निकाले
3,6,21,28,55,66, ?
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105, (x+4) × next numb in row
3 × 1 = 3
3 × 2 = 6
7 × 3 = 21
7 × 4 = 28
11 × 5 = 55
11 × 6 = 66
15 × 7 = 105
3 × 1 = 3
3 × 2 = 6
7 × 3 = 21
7 × 4 = 28
11 × 5 = 55
11 × 6 = 66
15 × 7 = 105
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