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
In the following question, select the missing number from the given series.
13, 19, 32, 51, 83, ?
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57, 54, 48, 39, ?, 12
23, 23, 46, 138, 552, ?
23, 19, 15, 11, ?
14, 14, 21, 42, 105, ?
42, 47, 52, 57, ?, 67
43, 58, 88, 133, ?, 268
67, 80, 93, ?, 119, 132