Add Math Textbook Form 5 Formative Exercise 1.1 Q4

Add Math Textbook Form 5 Formative Exercise 1.1 Q4

Postby Ski on Sun Jan 25, 2009 12:54 pm

T3 = 13
Last term, l = Tn = 148
d = 5

Tn = a + (n-1)d
T3 = a + (3-1)(5)
13 = a + 10
a = 3

The last term
Tn = a + (n-1)d
148 = 3 + (n-1)(5)
148-3 = 5n - 5
5n = 150
n = 30

Number of terms = 30
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