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Hallo Vicky think that the answer is correct, no matter what K is the units digit will always be 6...think makes sense P.S: In every case you have 6 multiplied by 6 which is ultimately 6( in units place) no matter what the power is
dear freinds.. u have missed one major pioint.
K is a prime number.
Thus whatever be the value of k =2,3,5...
Units digit of (76)^k will always be 6.
K > 2 . If it was given that k is integer also, then definitely stat. 2 is also suffecient.
what if k = 2.5, 3.5 or any other fraction...!!
Thus 2 is not suffecient.
Hence Ans - A.
ps: Please be cautious in DS questions that involves variables x, y or k.
Check 1: Note down the domain of these variables - positive, negative, or just real numbers.
Check 2: Be sure to check each statement 1 & 2 for all possible values of these variables x, y within the above domain: positive, negative, fractions, underroots, etc...