Answer :

Here, 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.

We have to find 10th common term i.e. n=10

Consider an A.P. in which a=11,d=20 and n=10

Then, a10=a+(10-1)d




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