If sin−1x+sin−1y+sin−1z=3π2, then ∑k=12 x100k+y106k∑x207y207 is
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a
13
b
43
c
23
d
none of these
answer is B.
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Detailed Solution
We have, sin−1x+sin−1y+sin−1z=3π2.It is possible only whensin−1x=π2,sin−1y=π2 and sin−1z=π2⇒x=1,y=1 and z=1∴ ∑k=12 x100k+y106k∑x207y207=x100+y106+x200+y212x207y207+y207z207+z207x207=1+1+1+11+1+1=43