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Intermediate June 2019 Unit 1 Q4

WJECIntermediateCurrent spec5 marksSequences

4.

(a) Write down the next two numbers in the following sequence. [2]

−19     −15     −11     −7     …….     ………

(b) Rods are used to make a sequence of patterns as shown below.
Pattern 1: a square of four rods with two diagonal rods forming an inverted V inside; Pattern 2: two such squares side by side sharing a vertical rod; Pattern 3: three such squares in a row

Pattern 1 uses six rods.

(i) How many rods are required to draw Pattern 4? [1]
(ii) Pattern 37 requires 186 rods.
How many rods are required to draw Pattern 38? [1]
(c) Describe in words the rule used in the following sequence. [1]

243     81     27     9     …….

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