Q70 A quantity is found to vary in the order 9, 16, 25, 36, 49. What will be the next number in the order?
(a) 57
(b) 64
(c) 68
(d) 61
Answer: (b) 64
Explanation:
The sequence is:
\( 3^2 = 9,\; 4^2 = 16,\; 5^2 = 25,\; 6^2 = 36,\; 7^2 = 49 \)
Next = \( 8^2 = 64 \)
This is a perfect square sequence, showing quadratic progression.