Question

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Answer 1

Answer:

Q3. (i) 36

(ii) 49

Step-by-step explanation:

Q3. (i)

Let's assume that,

S = 1  +  3 + 5 + 7 + 9 + 11

S = 11 + 9 + 7 + 5 +  3 + 1

Adding two equations above:

2S = 12 + 12 + 12 + 12 + 12 + 12

∴ S = 6 x 12/2 = 36

(ii)

Let's assume that,

S = 1  +  3 + 5 + 7 + 9 + 11 + 13

S = 13+ 11 + 9 + 7 + 5 +  3 + 1

Adding two equations above:

2S = 14 + 14 + 14 + 14 + 14 + 14 + 14

∴ S = 7 x 14/2 = 49