22. The biscuit section in a cookbook has 6 pages. The sum of all the page numbers in this section is 147. What is the number of the last page in this section of the book? (A) 26 (B) 27 (C) 28 (D) 29 (E) 30
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Step 1: The sum of the first $n$ natural numbers is given by $\frac{n(n+1)}{2}$. Show more…
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