Question
 In each of the following questions, a series is given,
with one term missing. Choose the correct alternative from the given ones that will complete the series. 4,18,48, ________, 180 ÂSolution
22x 1 = 4 32 x 2 = 18 42 x 3 = 48 52 x 4 = 100 62 x 5 = 180
Find the value of ‘x’ in the given expression:
(49/16)x × (64/343)x-1 = 4/7

If √k + (1/√k) = 8, then find the value of k + (1/k).
What is the HCF of (x³ + 3x² - x - 3) and (x³ + 4x² + x - 6)?
If, 4x + y = 10, and 2xy = 8, and 4x > y, then find the value of 64x³ – y³.
Evaluate (998)3 without multiplying directly.
If, ( a + b = 12 ) and ( a² + b² = 80 ), then find the value of (a³ + b³). Â
If n = 3 + √2, then find the value of (n + 1/n)².
 If f(x) = 3x² − 7x + 5, find f(2a) − 4f(a).
If 2x + y = 10 and 3x - 2y = 5, find the value of x + y.