Which of the following are in A.P. ? *
(a) 2a – b , 2a , a + b ,…..
(b) a – b , a , a + b ,……
(c) a – 2b , b , a + 2b
(d) a – b , 2a , a+ b
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is prashn ka Uttar hi b hi hi iska Uttar
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