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 .
Each of the number except 14, is an odd number .
Each of the given number is except 23, is perfect square
Each number except 279 is a multiple of 11.
Pattern is 1st x 2nd = 3rd; 2nd x 3rd = 4th, 3rd x 4th = 5th. But 4th x 5th = 50 x 500 = 25000 ? 5000 = 6th.
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.
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