Insert five numbers between $8$ and $26$ such that resulting sequence is an $A.P.$

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Let $A_{1}, A_{2}, A_{3}, A_{4}$ and $A_{5}$ be five numbers between $8$ and $26$ such that $8, A_{1}, A_{2}, A_{3}, A_{4}, A_{5}, 26$ is an $A.P.$

Here, $a=8, b=26, n=7$

Therefore, $26=8+(7-1) d$

$\Rightarrow 6 d=26-8=18$

$\Rightarrow d=3$

$A_{1}=a+d=8+3=11$

$A_{2}=a+2 d=8+2 \times 3=8+6=14$

$A_{3}=a+3 d=8+3 \times 3=8+9=17$

$A_{4}=a+4 d=8+4 \times 3=8+12=20$

$A_{5}=a+5 d=8+5 \times 3=8+15=23$

Thus, the required five numbers between $8$ and $26$ are $11,14,17,20$ and $23 .$

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$1.$  The sum $V_1+V_2+\ldots+V_n$ is

$(A)$ $\frac{1}{12} n(n+1)\left(3 n^2-n+1\right)$

$(B)$ $\frac{1}{12} n(n+1)\left(3 n^2+n+2\right)$

$(C)$ $\frac{1}{2} n\left(2 n^2-n+1\right)$

$(D)$ $\frac{1}{3}\left(2 n^3-2 n+3\right)$

$2.$  $\mathrm{T}_{\mathrm{T}}$ is always

$(A)$ an odd number $(B)$ an even number

$(C)$ a prime number $(D)$ a composite number

$3.$  Which one of the following is a correct statement?

$(A)$ $Q_1, Q_2, Q_3, \ldots$ are in $A.P.$ with common difference $5$

$(B)$ $\mathrm{Q}_1, \mathrm{Q}_2, \mathrm{Q}_3, \ldots$ are in $A.P.$ with common difference $6$

$(C)$ $\mathrm{Q}_1, \mathrm{Q}_2, \mathrm{Q}_3, \ldots$ are in $A.P.$ with common difference $11$

$(D)$ $Q_1=Q_2=Q_3=\ldots$

Give the answer question $1,2$ and $3.$

  • [IIT 2007]