Can YOU solve this sequence?

[caraway]

There's a chocolate prize up for grab- a tin of Celebrations- and I'm desperate for help. It goes- 100, 200, 400, 800, 1500. If only there wasn't the 1500. I've tried everything- adding then dividing, multiplying, seeing if it jumps. Anyone know the answer, or could give ideas on how to do it? The 'homework' is a parent's competition- the form actually said 'you can use outside help'. If you know the answer, can you give advice on how you got it instead of telling me the answer (I want to know how it's done, not just know the answer).

[caraway]

I need the next two in the sequence... normally I'm good at sequences!

[meditrina]

Prize money sequence from Who Wants to be a Millionaire?

It starts off doubling, then jumps like that.

[Svrider]

No idea sorry
If it makes you feel any better I took my dds homework to my work last week coz I couldn't do it
She's in year 3

[WillieWaggledagger]

I think it's the differences of the differences

100, 200, 400, 700 are the differences

So the differences of them are

100, 200, 300, 400

[follyfoot]

Running distances surely?

[WillieWaggledagger]

So next two numbers would I think be 2600 and 4200

Does that sound right to anyone else?

[wanderingalbatross]

Are you sure it's not a misprint?

You can fit an equation to that series, but it's a bit complicated and probably not what the organisers were intending!

[caraway]

Thanks everyone, especially WillieWaggledagger. I think I need to bone up on my sequences... The Celebrations are within my reach!

[DowntonTrout]

I would guess the next 2 are 5,000 and 10,000.

[DowntonTrout]

Oops too late and clearly wrong!

[meditrina]

I've just looked and it's not Millionaire prize money.

The running distances work, but then you get two possible answers: 3000 5000 (indoors only) or 5000 10000 (outdoors).

[ginmakesitallok]

I'd have thought running distances too - so would be 5,000 then 10,000?

[bigkidsdidit]

I too think it's running distances and would go with 5000 and 10000

[slambang]

Nah - it's adding odd numbered 100s in sequence
add 100, add 300, add 500, add 700 ...

[TheWoollybacksWife]

Running distances in metres? I would say the next two in the sequence would be 5,000 and 10,000 (unless you count the steeplechase at 3,000 metres)

[slambang]

Oh no, it isn't. . Yeah running.

[DowntonTrout]

But as there are clearly two different, but clearly correct answers you could point that out and maybe that will swing you the prize!

[Melpomene]

I think it's running distances and the next two would be 5000 and 10,000 (distances included in the Olympics).

[BikeRunSki]

I'm going with running too.

[notcitrus]

I bet its the Olympic running distances - topical innit.

[TwinMummy30]

hi i think i have it but not sure so...
100, 200, 400, 800, 1500, 2000, 3000
100+300=400
200+600=800
400+900=1500
800+1200=2000
1500+1500=3000

they are going up by 300, ..... if you jump every other

anyone correct me if I did it wrong

[TwinMummy30]

oops wrong! just saw it 400+900 isnt 1500