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Which of the following statement is correct

  1. $\triangle (U_k V_k) = U_k \triangle V_k + V_k \triangle U_k$
  2. $\triangle (U_k V_k) = U_{k+1}  \triangle V_k + V_{k+1} \triangle U_k$
  3. $\triangle (U_k V_k) = V_{k+1} \triangle U_k + U_k \triangle V_k$
  4. $\triangle (U_k V_k) = U_{k+1} \triangle V_k + V_k \triangle U_k$
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b) is correct
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