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4 Find the sum of divisors of 544 which are perfect squares.
A. 32
B. 64
C. 42
D. 21
See Answer & Explanation Lets Discuss
Correct answer is : D
Explanation

544= 25 + 171 =(20+21+22+23+24+25) x (170 + 171).

Here 20=1 =11 A perfect Square,

22 and 24=16=44 are perfect Squares, Hence,

1 + 4 + 16= 21

 

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