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The 10th common term between the A.P.s...

The 10th common term between the A.P.s 3,7,11,15, and 1,6,11,16,.. is
a.`191` b. `193` c. `211` d. none of these

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Given
Common difference of first A.P. is `d = 7-3 = 4`
And common difference of second A.P. is `d' = 6-1 = 5`
Now L.C.M of d and d'=`(4,5) = 20 `
Also first common term in both A.P.s is 11.
n =10
Consider an A.P. in which a=11,d = 20 and n = 10
...
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