Form 5 Chapter 12 (Progressions) - Spm Practice Worksheet With Answers Page 3
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1
2
3
4
516 50, 46, 42, … → A.P.
17
S
= 30
∞
20
T
< 0
= 30
n
1 – r
50 + (n – 1)(–4) < 0
20
50 – 4n + 4 < 0
1 – r =
30
–4n + 54 < 0
2
–4n < –54
1 – r =
3
–54
n >
1
r =
–4
3
1
n > 13
2
Hence, the least value of n is 14.
42
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