Rajasthan BoardEnglish MediumSTD 11 ScienceMATHSArithmetic Progressions2 Marks
Question
Insert 7 A.M.s between 2 and 17.
✓
Answer
Let A1, A2, A3, A4, A5, A6, A7 be the seven A.M.s between 2 and 17. Then, 2, A1, A2, A3, A4, A5, A6, A7 and 17 are in A.P. whose common difference is as follows: $\text{d}=\frac{17-2}{7+1}$ $=\frac{15}{8}$ $\text{A}_1=2+\text{d}=2+\frac{15}{8}=\frac{31}{8}$ $\text{A}_2=2+2\text{d}=2+\frac{15}{4}=\frac{23}{4}$ $\text{A}_3=2+3\text{d}=2+\frac{45}{8}=\frac{61}{8}$ $\text{A}_4=2+4\text{d}=2+\frac{15}{2}=\frac{19}{2}$ $\text{A}_5=2+5\text{d}=2+\frac{75}{8}=\frac{91}{8}$ $\text{A}_6=2+6\text{d}=2+\frac{45}{4}=\frac{53}{4}$ $\text{A}_7=2+7\text{d}=2+\frac{105}{8}=\frac{121}{8}$ Hence, the required A.M.S are $\frac{31}{8},\ \frac{23}{4},\ \frac{61}{8},\ \frac{19}{4},\ \frac{91}{8},\ \frac{53}{4},\ \frac{121}{8}.$
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