Question

which term of the arithmetic progression 4,9,14,_is 249?​

Answer 1

Answer:

a=4 d=5

an=a+(n-1)d

249=4+(n-1)5

245=5n-5

250=5n

n=50

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Answer 2

Answer:

n=50

Given:-

a=4, d=9-4=5, $a_{n}$=249

To solve:- $n_{249}$

Solution:-

$a_{n}$=a+(n-1)d

put the values.

249=4+(n-1)(5)

249-4=5n-5

245+5=5n

n=250/5

n=50