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If cos^-1p+cos^-1q+cos^-1r=pi(0 <= p,q,r...

If `cos^-1p+cos^-1q+cos^-1r=pi(0 <= p,q,r <= 1).` then the value of `p^2+q^2+r^2+2pqr` is

A

0

B

1

C

2

D

none of these

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The correct Answer is:
B
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FIITJEE-MATHEMATICS -ASSIGNMENT (SECTION(I) MCQ(SINGLE CORRECT)
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