[email protected] AriTmatiKa
U9 - U6 = 18
8b - 5b = 18
3b = 18
b = 6
U12 = a + 17b
72 = a + (17 × 6)
a = 72 - 102
a = -30
U9 = a + 8b = -30 + 48 = 18 ✔
U6 = a + 5b = -30 + 30 = 0 ✔
S25
= n/2 (2a + 24b)
= 25/2 (-60 + 144)
= 25/2 × 84
= 25 × 42
= 1050 ✔
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Verified answer
[email protected] AriTmatiKa
U9 - U6 = 18
8b - 5b = 18
3b = 18
b = 6
U12 = a + 17b
72 = a + (17 × 6)
a = 72 - 102
a = -30
U9 = a + 8b = -30 + 48 = 18 ✔
U6 = a + 5b = -30 + 30 = 0 ✔
S25
= n/2 (2a + 24b)
= 25/2 (-60 + 144)
= 25/2 × 84
= 25 × 42
= 1050 ✔