IMPORTANT MATH FORMULAE BY DAS SIR 08961556195

FOR STUDY MATERIAL BAK SSC ETC EXAMS CALL 08961556195 EMAIL Tamal 253 Yahoo Com IMPORTANT MATH FORMULAE Sum First Natural

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FOR STUDY MATERIAL OF BAK SSC ETC EXAMS CALL 08961556195 OR EMAIL Tamal 253 Yahoo Com IMPORTANT MATH FORMULAE 1 Sum Of First N Natural Numbers N N 1 2 2 Sum Of The Squares Of First N Natural Numbers N N 1 2 N 1 6 3 Sum Of The Cubes Of First N Natural Numbers N N 1 2 2 4 Sum Of First N Natural Odd Numbers N 2 5 Average Sum Of Items Number Of Items Arithmetic Progression A P An A P Is Of The Form A A D A 2 D A 3 D Where A Is Called The First Term And D Is Called The Common Difference 1 Nth Term Of An A P Tn A N 1 D 2 Sum Of The First N Terms Of An A P Sn N 2 2 A N 1 D Or Sn N 2 First Term Last Term Geometrical Progression G P A G P Is Of The Form A Ar Ar 2 Ar 3 Where A Is Called The First Term And R Is Called The Common Ratio 1 Nth Term Of A G P Tn Arn 1 2 Sum Of The First N Terms In A G P Sn A 1 Rn 1 R Permutations And Combinations N Pr N N R N Pn N N P 1 N N Cr N

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