2024 Ext2 HSC Solutions to Q10 and Q16bii (2 Viewers)

[epicmaths]

These took a while to write out - I wonder how they will mark 16bii), the justify definitely deserves 1 mark beyond just recognising a pattern.

My preferred way to answer this question is using modulo 18,
NESA's likely preference is mathematical induction.

Either way this is a demanding mark to achieve if they commit to marking the justification properly.

 

[jonolad69]

q10 doesnt seem right, may want to double check ur solutions

also q17

 

[SMARTYPANTS_SINGH]

q10 doesnt seem right, may want to double check ur solutions

also q17

For 10 the working out or the answer doesn’t seem right? Cause everyone I’ve talked to said it’s D

 

[jonolad69]

For 10 the working out or the answer doesn’t seem right? Cause everyone I’ve talked to said it’s D

the answer is B

 

[jonolad69]

why does everything think its D? i dont get it.

if u do ur h/w u can clearly see its D

 

[kendricklamarlover101]

the way i did bii) was proving that

using sum to product formula surely i get the full marks right

 

[epicmaths]

the way i did bii) was proving that

using sum to product formula surely i get the full marks right

Oooh that's lit, I'm sure that would do it and funnily enough sum to product also produces a divisibility by 18 argument.