Answer:
Step-by-step explanation:
a₁ = 3 , a₂ = 4
d = a₂ - a₁ = 4 - 3 = 1
T₄ = a + ( n-1 )d
= 3 + ( 21 - 1 )x1
= 3 + 20
= 23
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Answer:
Step-by-step explanation:
a₁ = 3 , a₂ = 4
d = a₂ - a₁ = 4 - 3 = 1
T₄ = a + ( n-1 )d
= 3 + ( 21 - 1 )x1
= 3 + 20
= 23