Suku kedua dan ketujuh barisan aritmatika berturut- turut 10 dan 45. Suku ke-40 barisan tersebut adalah .
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Un = a + ( n - 1 ) bU2 = a + b = 10
U7 = a + 6b = 45
------------------------(-)
- 5b = - 35
b = 7
a + b = 10
a + 7 = 10
a = 10 - 7
a = 3
U40 = a + 39b
= 3 + 39(7)
= 3 + 273
= 276