hitunglah hasil dari (tanpa menghitung satu persatu) 1+3+5......+47+49 2+4+6+......+96+98+100

•
1 + 3 + 5 + ... + 47 + 49 --> 25 suku
= (1 + 49) + (3 + 47) + ... + (23 + 27) + 25
= 50 + 50 + ... + 50 + 25
= 50 × 24/2 + 25
= 600 + 25
= 625

•
2 + 4 + 6 + ... + 98 + 100 ---> 50 suku
= (2 + 98) + (4 + 96) + ... + (48 + 52) + 50 + 100
= 100 + 100 + ... + 100 + 50 + 100
= 100 × 48/2 + 50 + 100
= 2400 + 150
= 2550