Question on: WAEC Mathematics - 2005
A sequence is given by (2\frac{1}{2}, 5, 7\frac{1}{2}, .....) if the nth term is 25, find n
A
9
B
10
C
12
D
15
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Correct Option: B
(a = 2\frac{1}{2}, nth = a + (n-1)d \Rightarrow 25 = 2\frac{1}{2} + (n-1)2\frac{1}{2}<br /> 25 = \frac{5}{2}+(n-1)\frac{5}{2} \Rightarrow 22\frac{1}{2} = \frac{5n-5}{2}\Rightarrow \frac{45}{2} = \frac{5n-5}{2}<br /> 45 = 5n - 5 \Rightarrow 5n = 50 \Rightarrow n = 10)
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