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- Question 20 and 21, Exercise 4.4
- given $a_1=3$ and $a_5=48$. Assume $r$ be common difference, then by general formula for nth term, we have $$... given $a_1=3$ and $a_5=48$. Assume $r$ be common difference, then by general formula for nth term, we have $$
- Question 1 and 2, Exercise 4.8
- stan. =====Question 1===== Using the method of difference, find the sum of the series: $3+7+13+21+\ldots$ t... m( =====Question 2===== Using the method of difference, find the sum of the series: $1+4+10+22+\ldots$ t
- Question 3 and 4, Exercise 4.8
- istan. =====Question 3===== Using the method of difference, find the sum of the series: $1+4+13+40+121+ \ldo... \). =====Question 4===== Using the method of difference, find the sum of the series: $1+2+4+7+11+16+\ldot
- Question 5 and 6, Exercise 4.8
- stan. =====Question 5===== Using the method of difference, find the sum of the series: $3+4+6+10+18+34+66+\... OOD =====Question 6===== Using the method of difference, find the sum of the series: $1+4+8+14+24+42+76+\
- Question 2, Exercise 4.2
- , \frac{5}{2}, \ldots$$ First, we find the common difference: \begin{align*} d &= \frac{3}{2} - \frac{1}{2} =
- Question 9 and 10, Exercise 4.2
- b, \dfrac{1}{c}$ are in A.P. Show that the common difference is $\dfrac{a-c}{2 a c}$. ** Solution. ** Since