.'. Missing number = 33 + 13 = 46.[/
7, 26, 63, 124, 215, 342, ?
518 05ff4645090f7ff566ffc548cExplanation:
Numbers are (23 – 1), (33 – 1), (43 – 1), (53 – 1), (63 – 1), (73 – 1) etc.
So, the next number is (83 – 1) = (512 – 1) = 511.
4, -8, 16, -32, 64, ?
538 15ff4633da35698574e567c6aExplanation:
Each number is the proceeding number multiplied by -2.
So, the required number is -128.
2, 6, 12, 20, 30, 42, 56, ?
493 05ff44c7ffc463f4c73681a68The pattern is 1 x 2, 2 x 3, 3 x 4, 4 x 5, 5 x 6, 6 x 7, 7 x 8.
So, the next number is 8 x 9 = 72.