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- Question 3 & 4 Exercise 4.3
- ers divisible by $5$ from $25$ to $350$. GOOD ====Solution==== The numbers divisible by $5$ from $25$ tò $35... the sum of their cubes is $6336$ . Find them. ====Solution==== Let us suppose the three numbers are $a-d, a,
- Question 2 Exercise 4.3
- one that is missing: $a_1=2, n=17, d=3$. GOOD ====Solution==== Given: $a_1=2, n=17, d=3$ \\ We need to find ... that are missing $a_1=-40, S_{21}=210$. GOOD ====Solution==== Given: $a_1=-40$ and $S_{21}=210$.\\ So we ha... that are missing $a_1=-7, d=8, S_n=225$. GOOD ====Solution==== Given: $a_1=-7, d=8, S_n=225$, we have to fin... ne that are missing: $a_n=4, S_{15}=30$. GOOD ====Solution==== Given: $a_n=4, S_{15}=30$.\\ Thus we have $n=
- Question 1 Exercise 4.3
- $9,7,5,3, \ldots$; 20th term; 20 terms. GOOD ====Solution==== Let $a_1$ be first term and $d$ be common dif... {7}{3}, 2, \ldots$; 11th term; 11 terms. GOOD ====Solution==== Let $a_1$ be first term and $d$ be common dif
- Question 14 Exercise 4.2
- three arithmetic means between 6 and 41. GOOD ====Solution==== Let $A_1, A_2, A_3$ be three arithmetic means... four arithmetic means between 17 and 32. GOOD ====Solution==== Let $A_1, A_2, A_3, A_4$ be four arithmetic m
- Question 17 Exercise 4.2
- means is $7: 13$, find the value of $n$. GOOD ====Solution==== Let $A_1, A_2, A_3, \ldots, A_n$ be $n$ arith
- Question 16 Exercise 4.2
- the arithmetic mean between $5$ and $8$. GOOD ====Solution==== Let $A_1, A_2, A_3, A_4, A_5$ be five arithme
- Question 15 Exercise 4.2
- here $a$ and $b$ are not zero simultaneously. ====Solution==== Suppose $A$ represents the arithmetic mean be
- Question 12 & 13 Exercise 4.2
- ry during his twenty first year of work? GOOD ====Solution==== Suppose $a_1$ represents salary of worker at ... e arithmetic mean between $12$ and $18$. GOOD ====Solution==== Here $a=12, b=18$.\\ Let say $A$ be arithmeti... an between $\dfrac{1}{3}$ and $\dfrac{1}{4}$. ====Solution==== Here $a=\dfrac{1}{3}, b=\dfrac{1}{4}$,\\ Let ... d the arithmetic mean between $-6,-216$. GOOD ====Solution==== Here $a=-6, b=-216$.\\ Let $A$ be arithmetic
- Question 11 Exercise 4.2
- they reach the top of a 5400 feet hill? GOOD ====Solution==== Suppose $a_1$ represent the distance climb by
- Question 10 Exercise 4.2
- 20135, what was its population in 1970? GOOD ====Solution==== Suppose $a_1$ represents the population in 19
- Question 9 Exercise 4.2
- y meters it covered in the eight second? GOOD ====Solution==== Suppose that $$a_1=24,$$ $$a_2=21,$$ $$a_3=1
- Question 8 Exercise 4.2
- \dfrac{1}{b}, \dfrac{1}{c}$ are in A.P. GOOD ====Solution==== Since $\dfrac{b+c-a}{a}, \dfrac{c+a-b}{b}, \d
- Question 7 Exercise 4.2
- ac{2}{3}$, find the arithmetic sequence. GOOD ====Solution==== Let $a_1$ be first term and $d$ be common dif
- Question 5 and 6 Exercise 4.2
- , \ldots$$ is an A.P. Also find its nth term. ====Solution==== We first find $n$th term. Each term of the se... k-4$ are in A.P. Also find the sequence. GOOD ====Solution==== Since the given terms are in A.P, \begin{alig
- Question 3 and 4 Exercise 4.2
- arithmetic progression $6,9,12, \ldots, 78$. ====Solution==== Here $a_1=6$ and $d=9-6=3$ and $a_n=78$.\\ We... ithmetic progression. Also find its 7th term. ====Solution==== Given that $$a_n=2 n+7. --- (1)$$ Then \begin