SSC CGL Quant · Chapter Test
Number System & Simplification — 25-Question Test
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Formula Reference Sheet
This chapter
HCF, LCM & products
| HCF x LCM | HCF(a,b) x LCM(a,b) = a x b |
|---|---|
| Numbers as multiples | a = HCF x m, b = HCF x n with m, n coprime |
| LCM of fractions | LCM = LCM(numerators) / HCF(denominators) |
| HCF of fractions | HCF = HCF(numerators) / LCM(denominators) |
Counting & series
| Sum 1..n | n(n+1)/2 |
|---|---|
| Sum of squares | n(n+1)(2n+1)/6 |
| Number of factors of N = p^a x q^b | (a+1)(b+1) |
| Sum of first n odd numbers | n^2 |
Indices & surds
| Product rule | a^m x a^n = a^(m+n) |
|---|---|
| Power of a power | (a^m)^n = a^(mn) |
| Rationalising | multiply by the conjugate to clear a surd denominator |
SSC reference
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