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InterviewSolution
| 1. |
The common difference of an A.P is 3 than a20-a15 is |
| Answer» We know that,an=a+(n-1)dSo,a20=a+(20-1)(3)a20=a+19(3)a20=a+57Similarly, a15=a+14da15=a+14(3)a15=a+42Now,a20-a15=(a+57)-(a+42)=a+57-a-42=57-42=15 | |