MCQ
The $10^{\text {th }}$ common term between the series $3+$ $7+11+$ _________________ and $1+6+11+\ldots$. Is
  • 191
  • B
    193
  • C
    211
  • D
    None of these

Answer

Correct option: A.
191
(A) 191
Explanation : The first common term is 11 . Now, the next common term is obtained by adding LCM of the common difference of 4 and 5, i.e,. 20 . Therefore, $10^{\text {th }}$ common term $=T_{10}$ of the A.P. whose first term, $a=11$ and common difference, $d=20$
$
T_{10}=a+9 d=11+9(20)=191
$

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