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If the common difference of an AP is 5, then what is a18 - a13?(A) 5 (B) 20 (C) 25 (D) 30NCERT Class XMathematics - Exemplar ProblemsChapter _ARITHMETIC



d=5____let first term be a of the A.P.____ a18-a14___a+(18-1)d-[a+(13-1)d]___a+17*5-a-12*5__85-60=25____ans is (c)25
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D=5 and is unknown then a+17(5)-a-12(5)=85-60=25
it is (c)25
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