1) n(n - 1) 2) n(n-1)/2 3) n(n + 1) 4) n(n+1)/2 Solution: The sum of the first n natural number = 1+2+3+...n Here a = 1, d = 1. Sum of AP... View Article
1) 100π sq cm 2) 5 sq cm 3) 25 sq cm 4) 100π/3 sq cm Solution: Option (1) 100π sq cm Given that ABC is a triangle, and ∠A = 30°, BC... View Article
1) 6√3 2) 12√3 3) 4√3 4) 8√3 Solution: Option (1) 6√3 Given that ABC is a triangle In a triangle AOB, tan 30° = 0B/OA 1/√3 = OB/6... View Article