DSSSB TGT c9sumnaturals — practice questions
12 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice DSSSB TGT c9sumnaturals in the app →Per NCERT Class 9 Math, what is the FORMULA for the sum of the first n natural numbers?Per NCERT, the sum of the first 10 natural numbers (1 + 2 + ... + 10) equals which value?Per NCERT, the FIRST KNOWN written mention of the formula Sₙ = n(n+1)/2 appears in which classical Indian textPer NCERT, the sum 1 + 2 + 3 + ... + 100 equals which value?Per NCERT, the nth TRIANGULAR NUMBER tₙ (1, 3, 6, 10, 15, ...) equals the sum of the first n natural numbers —Per NCERT, what is the 10th triangular number using tₙ = n(n+1)/2?Per NCERT, the sum 25 + 26 + 27 + ... + 58 can be computed as which expression?Per NCERT, the proof of Sₙ = n(n+1)/2 uses the algebraic identity 2S = n(n+1). What is the geometric INSIGHT bPer NCERT, the second part of Aryabhata's verse describes Sₙ as which equivalent expression?Per NCERT, a child arranges marbles in rows: 1 marble in row 1, 2 in row 2, 3 in row 3, ..., 25 in row 25. HowPer NCERT, the sum of 2-digit numbers DIVISIBLE BY 3 (12, 15, 18, ..., 99) is which value?Per NCERT, what is the sum of the first 20 natural numbers (1 + 2 + ... + 20)?