Pattern is 1st x 2nd = 3rd; 2nd x 3rd = 4th, 3rd x 4th = 5th. But 4th x 5th = 50 x 500 = 25000 ? 5000 = 6th.
Each number except 279 is a multiple of 11.
Alternately 23 is added and 17 is subtracted from the terms. So, 634 is wrong.
Terms at odd places are 5, 6, 7, 8 etc. and each term at even place is 16. So, 9 is wrong.
Each of the number except 12, is a prime number
Each of the number except 21, is an even number .
Number are 13, 23, 33, 43, 53, 63.
So, the missing number is 73 = 343.
Each number is the preceding number multiplied by - 2. So, the required number is - 128.
Prime numbers 2, 3, 5, 7, 11, 13 have successively been subtracted. So, 100 is wrong. It must be (108 - 11) i.e., 97.
Prime number 2, 3, 5, 7, 11, 13 are to be added successively. So, 165 is wrong.
Subtract 1, 3, 5, 7, 9, 11 from successive numbers. So, 34 is wrong.
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