The number are 7 x 8, 8 x 9, 9 x 10, 10 x 11, 11 x 12, 12 x 13 . So, 150 is wrong.
The number are square of odd natural numbers, starting from 5 up to 15. So, 36 is wrong.
Add 12, 22, 32, 42, 52,62 .
So, 91 is wrong.
In each number except 383, the product of first and third digit is the middle one.
The pattern is x2 + 1, where x = 1, 2, 3, 4, 5, 6, 7, 8 etc. But 64 is out of pattern
Multiply each term by 3 to obtain the next term. Hence, 30 is a wrong number.
The difference between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.
The terms are successively divided by 12, 10, 8, 6 .... etc. So, 24 is wrong.
The terms are alternately multiples by 1.5 and divided by 3. However 18.5 does not satisfy it.
2nd = (1st + 1) : 3rd = (2nd + 2); 4th = (3rd + 3); 5th = (4th +4).
But 18 = 6th term not equal ? 5th + 5 = 14 + 5 = 19.
Sum of the digits in each number, except 324 is 10.
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