U subscript 2 equals a space plus space left parenthesis 2 space minus space 1 right parenthesis b equals space a space plus space b space equals 10
U subscript 4 equals a space plus space left parenthesis 4 space minus space 1 right parenthesis b equals space a space plus space 3 b space equals 22
T e n t u k a n space n i l a i space a space d a n space b space t e r l e b i h space d a h u l u.
U subscript 4 minus U subscript 2 space equals space left parenthesis a plus 3 b right parenthesis minus left parenthesis a plus b right parenthesis
22 minus 10 space equals a minus a plus 3 b minus b
12 equals 2 b
b equals 12 over 2
equals 6
s u b t i t u s i k a n space n i l a i space b
a space plus space b space equals space 10
a space plus space 6 space equals 10
a equals 10 minus 6
equals 4
J u m l a h space 10 space s u k u space p e r t a m a space a d a l a h space s e b a g a i space b e r i k u t space
S subscript n equals n over 2 left parenthesis 2 a plus left parenthesis n minus 1 right parenthesis b right parenthesis
S subscript 10 equals 10 over 2 left parenthesis 2 left parenthesis 4 right parenthesis plus left parenthesis 10 minus 1 right parenthesis 6 right parenthesis
equals 5 left parenthesis 8 plus 9 left parenthesis 6 right parenthesis right parenthesis
equals 5 left parenthesis 8 plus 54 right parenthesis
equals 5 left parenthesis 62 right parenthesis
equals 310 space