What is the next number of the following sequence ?
21, 77, 165, 285, ......
The series follow the rule,
21 = 77 = 92-4165 = 132-4285 = 172-4
5,9,13,17,21,(+4)...In the same way next no. will be 212-4 = 441 - 4 = 437
A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.
17, 27, 42, 62,?
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130, 450, 970, 1690, ?
4, 18, 48, ?, 180
23, 32, 42, 53, 65, ?
5, 11, 24, 51, ?
28, 35, 49, ? , 98
4, 10, 33, 136, ?
13, 24, 46, 79, ?