question_answer

If a, b, c are respectively the \[{{p}^{th}},{{q}^{th}},{{r}^{th}}\]terms of an A.P., then

A) 1                     

B) -1   

C) 0                     

D) pqr

Correct Answer: C

Solution :

[c] : Let first term = A and common difference = D \[\therefore \] \[a=A+(p-1)D,b=A+(q-1)D,\]\[c=A+(r-1)D\] Operate\[{{C}_{1}}\to {{C}_{1}}-D{{C}_{2}}+D{{C}_{3}}\]