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The position vector of a point p is ...

The position vector of a point p is ` r = x hati + y hatj + z hatk ` where ` x in N , ` y `in ` N and ` a = hati + hatj + hatk ` if r . `""` a = 10 then the number of possible position of P is

A

36

B

72

C

66

D

none

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The correct Answer is:
A
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DIPTI PUBLICATION ( AP EAMET)-PERMUTATIONS & COMBINATIONS-EXERCISE 1B (COMBINATIONS )
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