20th term of an AP is 59, common difference is 3. Find 1st and 15th term

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Nevaeh · Answer

Answer:   part 1      n = 20     d = 3     so,          a+(n-1)d is formula to find term .    putting value in this formula     a+ (20-1)3 = 59    => a+ 19×3 = 59   => a+ 57 = 59   => a = 59-57  => a = 2     part 2    a= 2   d= 3   n= 15    so putting in a+(n-1)d    2 + (15-1) 3  => 2 + 14 × 3     => 2+ 42    44 is 15th term of an AP

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