d)
If'a' be the first term and 'd' be the common difference of
an A.P., then find the value of S28 - 2527+ S 26
Answers
Answered by
0
Answer:
54a + 703d - 2527
Step-by-step explanation:
Sn = n/2 { 2a +( n-1) d}
S28 - 2527+ S 26 = 28/2 { 2a +27 d} + 26/2 { 2a +25 d} - 2527
S28 - 2527+ S 26 = 2a (14 + 13) + d ( 27x14 + 25x13) - 2527
= 54a + 703d - 2527
Similar questions