Question:
In the sequence 2, 5, 8,..., which term's square is 2500?
A14
B15
C16
D17
Answer:
D. 17
Explanation:
If 2500 is the square of n th term of the sequence 2,5,8....... n th term= √2500 = 50 first term a = 2 common difference d = 3 n th term = a + (n - 1)d 50 = 2 + (n - 1)3 50 = 2 + 3n - 3 3n = 51 n = 51/3 = 17