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If A=35^ , B=15^ and C=40^ , then A B+ B C+ C A is equal to

Options

  1. A0
  2. B1
  3. C2
  4. D3

Correct answer

B. 1

Step-by-step solution

Given that, A=35^ , B=15^ and C=40^ aligned & (A+B+C) & = [ array c A+ B+ C - A B C array ] [ array c 1- A B- B C - C A array ] & (90^ ) & = A+ B+ C- A B C 1- A B- B C- C A & A B+ B C & + C A=1 & aligned

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