Math Is Fun Forum

Sins

Member

Registered: 2005-10-22

Posts: 1

Are these correct?

A)
1.    4,6,8,TEN,12,14,16.
2.    23,20,17,FOURTEEN,11,8,5
3.    4,10,16,TWENTY TWO,28,34,40
4.    20,18,16,14,TWELVE,14,16,18,20.
5.    2,3,5,6,EIGHT,9,11,12,14
6.    5,7,10,14,NINETEEN,25,32,40.
B)
1.    4,9,16,TWENTY FIVE,36,49,64.
2.    2,6,12,TWENTY,30,42,56.
3.    41,38,36,33,THIRTY ONE,28,26,23
4.    2,3,5,…,17,33,65
5.    3,5,4,6,…,7,6,8,7.
6.    99,80,63,FORTY EIGHT,35,24,15.

The words in Caps, are the ones I filled in previously to posting this. I would appreciate it, if someone could verify that they're correct. Also, could someone give me a little help on 'B)4/5', please?

Thanks people

ryos

Member

Registered: 2005-08-04

Posts: 394

Re: Are these correct?

All of yours look right to me.

B.4 is 2n - 1, so the missing number is 9.
B.5 alternates between adding 2 and subtracting 1, so the missing number is 5.

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El que pega primero pega dos veces.