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| 1. |
What is the common difference of an AP in which a(18)-a(13)=25? |
| Answer» let first term of AP is a and the common difference is d.\xa0We knowan\xa0= a + (n-1)dSo,\xa0{tex}a_{18} - a_{13} = 25 \\\\=> a+ (18-1)d - a - (13-1)d=25\\\\=> 17d -12d = 25 \\\\=> 5d = 25 \\\\=> d = 25\\div 5 = 5{/tex} | |