Sum of the digits in each number, except 324 is 10.
2nd = (1st + 1) : 3rd = (2nd + 2); 4th = (3rd + 3); 5th = (4th +4).
But 18 = 6th term not equal ? 5th + 5 = 14 + 5 = 19.
The terms are alternately multiples by 1.5 and divided by 3. However 18.5 does not satisfy it.
The terms are successively divided by 12, 10, 8, 6 .... etc. So, 24 is wrong.
The difference between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.
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.
Number are all primes. The next prime is 43.
Numbers are alternately multiplied by 2 and increased by 3. So, the missing number = 61 x 2 = 122.
The number are cubes of primes i.e., 23, 33, 53, 73, 113. Clearly, none is wrong.
Alternetly, we add 4 and double the next. So, 132 is wrong. It must be (68 x 2) i.e., 136.
The pattern is 1 x 3, 2 x 5, 3 x 7, 4 x 9, 5 x 11, 6 x 13, 7 x 15 etc.
So 70 is not correct.
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