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If a+1/a=3, then (a^4+1/a^4) is equal to...

If `a+1/a=3`, then `(a^4+1/a^4)` is equal to :
यदि `a+1/a=3` है, तो `(a^4+1/a^4)` का मान किसके बराबर है ?

A

77

B

47

C

81

D

27

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PINNACLE-ALGEBRA-EXERCISE
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