64) Choose the correct alternative that will continue the same pattern and replace the question mark (?) in the given series. 120, 99, 80, 63, 48, ?

65) Choose the correct alternative that will continue the same pattern and replace the question mark (?) in the given series. 1, 5, 14, 30, 55, 91, ?

66) Choose the correct alternative that will continue the same pattern and replace the question mark (?) in the given series. 2, 12, 36, 80, 150, ?

67) Choose the correct alternative that will continue the same pattern and replace the question mark (?) in the given series. M, N, O, L, R, I, V, ?

68) A and B are brothers. C and D are sisters. A's son is D's brother. How is B related to C?