GRE
$$C_{12}$$
($$49^{7}$$)$$C_{26}$$
The sum of the terms in the sequence
51
The number of different four-digit integers that can be formed by elements from Set A (all the elements can be used by more than once)
The number of different three-digit integers that can be formed by elements from Set B (all the elements can be used by more than once)
x-y
z
The probability that the number selected will have a units digit of 6
The probability that the number selected will have a tens digit of 6
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