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JEE Mains · Maths · STD 12 - 10. vector algebra

ધારોકે \(a, b, c\) એ ત્રણ ભિન્ન વાસ્તવિક સંખ્યાઓ છે,જેમાની કોઈ પણ બરાબર એક નથી.જો સદિશો \(a \hat{ i }+\hat{ j }+\hat{ k }, \hat{ i }+b \hat{j}+\hat{ k }\) અને \(\hat{ i }+\hat{ j }+c \hat{ k }\) સમતલીય હોય,તો \(\frac{1}{1-a}+\frac{1}{1-b}+\frac{1}{1-c}=..........\)

  1. A \(1\)
  2. B \(-1\)
  3. C \(-2\)
  4. D \(2\)
Verified Solution

Answer & Solution

Correct Answer

(A) \(1\)

Step-by-step Solution

Detailed explanation

\(\left|\begin{array}{lll}a & 1 & 1 \\ 1 & b & 1 \\ 1 & 1 & c\end{array}\right|=0\) \(C _2 \rightarrow C _2- C _1, C _3 \rightarrow C _3- C _1\) \(\left|\begin{array}{lll}a & 1-a & 1-a \\ 1 & b -1 & 0 \\ 1 & 0 & c -1\end{array}\right|=0\) \(a(b-1)(c-1)-(1-a)(c-1)+(1-a)(1-b)=0\)…
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