G4. If the common difference of the A.P is 3, then find the value of a – InterviewSolution

1.

G4. If the common difference of the A.P is 3, then find the value of a20-a15

Answer»

We know that,an=a+(n-1)dSo,a20=a+(20-1)(3)a20=a+19(3)a20=a+57

Similarly, a15=a+14da15=a+14(3)a15=a+42

Now,a20-a15=(a+57)-(a+42)=a+57-a-42=57-42=15

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