If p,q,r and s are in AP, then which of the following is true?
A
p−q=s−r
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B
p+q+r+s=0
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C
p+q=r+s
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D
q−p=s−r
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Solution
The correct option is Dq−p=s−r A sequence of numbers is called an arithmetic progression if the difference between any two consecutive terms is always the same. Given that p,q,r and s are in AP. ⟹q−p=r−q=s−r