CBSE Class 12 Math 2020 Outside Delhi Set 2 Solved Paper - ...

CBSE Class 12 Math 2020 Outside Delhi Set 2 Solved Paper

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Question : 2 of 11

Marks: +1, -0

Let

{a}↖{→}={i}↖{\^}-2 {j}↖{\^}+3 {k}↖{\^}

. If

{b}↖{→}

is a vector such that

{a}↖{→}, {b}↖{→}=|{b}↖{→}|^2

and

|{a}↖{→}-{b}↖{→}|={√{7}}

, then

|{b}↖{→}|

equals

7
14
${√{7}}$
21

Solution:

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