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B
1
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C
1a
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D
none of the above
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Solution
The correct option is B 1 L.H.S =(ama−n)m−n×(ana−1)n−1×(a1a−m)1−m =(am+n)m−n×(an+1)n−1×(am+1)1−m =(a(m2−n2)×(a(n2−12)×(a(12−m2) =am2−n2+n2−1+1−m2 =a0 =1 =R.H.S