issb mathematics MCQ #589

Sum of first 12 natural numbers?

issb mathematics MCQ #589

  1. Question 1

    Q1. Sum of first 12 natural numbers?

    • A) 66
    • B) 72
    • C) 78
    • D) 84

    Answer: 78

    Explanation: Formula n(n+1)/2 gives 12 times 13 divided by 2 equals 78. Work each step carefully; ISSB math rewards accuracy under time pressure.