Question : What is the sum of all the common terms between the given series $S1$ and $S2$? $\begin{aligned} & S 1=2,9,16, \ldots \ldots, 632 \\ & S 2=7,11,15, \ldots \ldots, 743\end{aligned}$
Option 1: 6974
Option 2: 6750
Option 3: 7140
Option 4: 6860
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Correct Answer: 6974
Solution : Given: The series is $\begin{aligned} & S 1=2,9,16, \ldots \ldots, 632 \\ & S 2=7,11,15, \ldots \ldots, 743\end{aligned}$. From series $S1$ and $S2$, first common term = 23, second common term = 51. ⇒ $d=51–23=28$ Use the formulas, $a_n=a+(n–1)d$, $S_n=\frac{n}{2}[2a+(n–1)d]$, where $a_n$, $n$, $a$, $d$, and $S_n$ are the $n$th term in the sequence, the number of terms, the first term in the sequence, the common difference, and the sum. ⇒ $a_n=a+(n–1)d\leq 632$ ⇒ $23+(n–1)28\leq 632$ ⇒ $(n–1)28\leq 632–23$ ⇒ $(n–1)28\leq 609$ ⇒ $n–1\leq 21.75$ ⇒ $n\leq 22.75$ So, the value of $n=22$. The sum of all the common terms between the given series S1 and S2 = $\frac{22}{2}[2\times 23+(22–1)\times28]$. = $11\times [46+21\times28]$ = $11\times [46+588]$ = $11\times 634$ = $6974$ Hence, the correct answer is 6974.
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