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WAEC 2019 · Paper 1 · Q42

The fourth term of an arithmetic progression is 37 and the first term is −20-20. Find the common difference.

Worked solution (try it first)
  1. The 4th term of an A.P. is a+3da + 3d, so −20+3d=37-20 + 3d = 37.
  2. Add 20 to both sides: 3d=573d = 57.
  3. Divide by 3: d=19d = 19, option C.

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