Solution
The numbers which are divisible by 7, in between 200 to 400 are given below,
$$203,210, 217..........399$$
We know for the AP series,
$$\Rightarrow t_n=a+(n-1)d$$
$$\Rightarrow 399=203+7(n-1)$$
$$\Rightarrow 7(n-1)=399-203=196$$
$$\Rightarrow n-1=\dfrac{196}{7}$$
$$n=28+1=29$$
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