Asked by mfon

the 9th and 22nd terms of an A.P are 29 and 55,respectively.find the sum of its first 10 term
Answered by mfon
yeah
Answered by mfon
yes
Answered by oobleck
13d = 55-29
d = 2
so a = 29-8*2 = 13
S10 = 10/2 (2a+9d)
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