How many natural numbers are there between 46 and 78 which are exactly divisible by 6?
Question
How many natural numbers are there between 46 and 78 which are exactly divisible by 6?
Required numbers are 48, 54, 60, ........... 78
This is an A.P. in which a = 48, d = 6 and l = 78
Let the number of terms in it be n.
Then tn = a + (n - 1)d = 78
48 + (n - 1) x 6 = 78
(n - 1) x 6 = 30
(n - 1) = 5
n = 6
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Aptitude