3 : 27 :: 11 : ?
A121
B1221
C1331
D1441
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Select the pair that follows the same pattern as that followed by the two pairs given below. Both pairs follow the same pattern.
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GMR : JPU
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6 : 18 :: 4 :
In the sereis 6 4 1 2 2 8 7 4 2 1 5 3 8 6 2 1 7 1 4 1 3 2 8 6 how many pairs of alternate numbers have a difference of 2?