The 9th common term in A.P's 2, 4, 6, 8, ........ and 1, 4, 7, 10, .........
50
52
54
56
Writing few common terms : 4,6,16....
So terms common in 2 A.P.'s always form an A.P.
Clearly first common term is 4.
Next common term is 10
Also, d for common AP = lcm (d1, d2)
= lcm (2,3)
= 6
So common terms are are
4,10, 16, 22, ......
So 9th common term will be
Study 40% syllabus and score up to 100% marks in JEE