Sum of first 9 terms is 261 and next 6 terms is 444 .find common difference and first terms algebraic expressions
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Answer:
given
sum of first nine terms is
A1+A2+A3+ --------------+ a9. = 261
A10+ A11+ -----------_----a15= 444
Step-by-step explanation:
then by the problem
9a + 36d = 269. ( 1 )
6a + 69d = 444. ( 2 )
let eq ( 1 ) × 6
and eq (2) × 9 =
54a + 216 d = 269× 6
54a + 621d = 444× 9
subract eq 1 from eq 2
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