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Q.

Number of points having position vector ai+bj+ck, where a,b,c1,2,3,4,5 such that 2a+3b+5c is divisible by 4 is R then R10=

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a

7

b

8

c

6

d

9

answer is B.

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Detailed Solution

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2a+3b+5c=2a+4-1b+4+1c  is divisible by 4 Case (i)a=2,3,4,5 b=1,3,5 c=1,2,3,4,5 Number of vectors= 4x3x5=60  case (ii) a=1     b=2,4     c=1,2,3,4,5 Number of vectors=1x2x5=10  Total no.of ways=60+10=70=R

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