another math problem

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<p>I got the answer, which is 1319, but I still have a question. How do I find out the # of people who chose ONLY calling, text messaging, and instant messaging? Please explain!</p>

<p>1478+452+1409</p>

<p>I’m pretty sure it’s 1319 as well. To find out the only number, just look at the venn diagram. Calling = 1478 (only 1478 use “calling”), etc.</p>

<p>But don’t those numbers include the people who selected both?</p>

<p>No, 1478 is ONLY Calling, 355 is Calling and Texting.
1409 is ONLY Instant messaging, and 463 is Calling and IM… etc.</p>