mmm
what formulae did every use?
did u use "h/3[a+l + 4[odd] + 2[even]" ??
coz i was doing 3u test today, found a similar-ish question
instead of using that formulae,
answers had:
h/3 [a + l + 4 ( [a+b]/2) ]
so yeah . .maybe that's why it was in q10~
i dnno, prove me wrong ppl...