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Que. The number of different n × n symmetric matrices with each element being either 0 or 1 is:
(Note: power(2, x) is same as 2x)
a. power(2, n)
b. power(2, n^2)
c. power(2, (n^2 + n)/2)
d. power(2, (n^2 - n)/2)
Answer:power(2, (n^2 + n)/2)
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