Question

The four arithmetic means between 3 and 23 are [MP PET 1985]
A) 5, 9, 11, 13 B) 7, 11, 15, 19 C) 5, 11, 15, 22 D) 7, 15, 19, 21

Answer 1

Hey!
Here is your answer !


Answer is option B
How ?

Then check :
In option b we find that the common difference is same ( That is any term - preceding term is constant )
11-7=4 then 15-11=4 and 19-15=4
so they have the same common difference and so they are in AP

While in option a c and d we find that any term when substracted from the preeceding term is not constant that is the common differnce is not same so all the rest option are not in Ap
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Hope it helps