Question

Find the sum of the first 50 common terms of 12,16,20,... and 18,24,30,.... is _____?

Answer 1

In The AP 12,16,20 And 18, 24,30. 24,36,48 are common terms. Sn=n/2{ 2a +(n-1)d}. n=50. Sn=? d=36-24=12. a=24.