Let three vectors a, b and c be such that c is coplanar with a and b, a \cdot c=7 and b is perpendicular to c, where a=-{i^{∧}+{j^{∧}+{k^{∧} and b=2 {i^{∧}+{k^{∧}, then the value of 2|a+b+c|^{2} is .............. . [24 Feb 2021 Shift 1]

JEE Main 24 Feb 2021 Shift 1 Solved Paper

Section: Mathematics

Question : 89 of 90

Marks: +1, -0

Let three vectors a,b and c be such that c is coplanar with a and b, a⋅c=7 and b is perpendicular to c, where a=−

∧

and b=2

∧

, then the value of 2|a+b+c|2 is .............. .

[24 Feb 2021 Shift 1]

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