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Foundation June 2019 Unit 1 Q11

WJECFoundationCurrent spec5 marksSequences

11.

(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 rods inside forming an inverted V. Patterns 2 and 3: two and three such squares joined side by side, sharing vertical rods

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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