Answer :

Starting from 50 the first number divisible by 6 is 54, this series will go forward as 60, 66 and so on

⇒ And moving back from 350 the last number will be 348

We know

t_{n} = a + (n-1)d

348 = 54 + (n-1)6

348-54 = 6n-6

6n = 300

n = 50

t_{15} = 54 + (15-1)6

t_{15} = 138

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