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2 , between every two odd numbers there is one even number
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NB 3,9,21,39,63. We note that #1;The difference between 3 & 9 = 6 #2 ;The difference between 9 & 21 = 12 ( 2 x 6) #3 ; The difference between 21 & 39 = 18 ( 3 x 6) #4 ; The difference between 39 & 63 = 24 ( 4 x 6) So it follows #5 ; The difference between 63 & X = ( 5 x 6 = 30 ) So 63 + 30 = 93 The answer !!!!!
-3^2 = 9 -(3^2) = -9
37, this sequence counts up from 5 the difference between 2 and 7. the difference between 20 and 28 is 8 making the next number 9, and 28 and 9 = 37.