Correct Answer: (a) 144
Solution:पहली पंक्ति में :- (15 × 4) + 2 = 60 + 2 = 62 , (62 × 2) - 4 = 124 - 4 = 120 दूसरी पंक्ति में : - (18 × 4) + 2 = 72 + 2 = 74, (74 × 2) - 4 = 148 - 4 = 144 तीसरी पंक्ति में : - (21 × 4) + 2 = 84 + 2 = 86, (86 × 2) - 4 = 172 - 4 = 168