2020
Mathematics
POST UTME
The 4th term of an Ap is 13, the 10th term is 31. Find the 21st term.
A.
64
B.
45
C.
75
D.
95
Correct Answer: 64
Explanation
Given the formula
U= a(n-1)d
U4= a(4-1)d
U4= a+ 3d= 13……eq1
U10= a+ 9d = 31……eq2
Given the formula
U= a(n-1)d
U4= a(4-1)d
U4= a+ 3d= 13……eq1
U10= a+ 9d = 31……eq2
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