Merchant Taylor's question 20 specimen paper

[Deverills]

http://www.mtsn.org.uk/fileadmin/conten ... ePaper.pdf" onclick="window.open(this.href);return false;

Any idea on number 20 I got the answer 3 but not sure. The question is how many different 3 digit numbers can you make from digits 1,1,3. You can use each digit as many times as you like.

[Guest55]

Think systematically when tackling this type of question:

111 [three 1s]

113 [two 1s, one 3]
131
311

133 [one 1, two 3s]
313
331

333 [three 3s]

[Deverills]

Thank you. I wasn't sure about the use of the numbers seems obvious now "you" answered it. Any chance you would know answers to these papers?

[Guest55]

Have you searched on here? I've answered a number of questions over the years ...

[russet]

I think the question is badly worded. Why repeat the 1?

[Guest55]

I don't agree - I think the wording is deliberately testing them to read what it says.