Answer:
Choice B is correct answer.
Explanation:
From given data,we observe that
a₁ = 3 and a₂ = 10 and a₃ = 17
Then the difference d between the successive terms is 7.
d = 7 which is constant.
Therefore, it is arithematic progression.
The formula for nth term of arithematic progression is :
f(n) = aₙ = a₁ + (n-1)d
putting above values in formula,we get
f(n) = 3+ (n-1)7
f(n) = 3+7n-7
f(n) = 7n-4 which is the answer.