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If the 6th term of an arithmetic progression is... - JAMB Mathematics 1994 Question

If the 6th term of an arithmetic progression is 11 and the first term is 1, find the common difference.
A
\(\frac{12}{5}\)
B
\(\frac{5}{3}\)
C
-2
D
2
correct option: d
In an AP, Tn = a + (n - 1)d

T6 = a + 5d = 11

The first term = a = 1

∴ T6 = 1 + 5d = 11

5d = 11 - 1

5d = 10

∴ d = 2
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