Find sum of 25th term whose first term is 5 and last term is 77.
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0
Answer:
the sum of terms 25 the first term us 5 last us term 25+5=30 the last term 30+77=100
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1
Step-by-step explanation:
a10= 5
a+9d=5 (1)
a18 = 77 (2)
substitute in eq (1) and (2)
(a+9d) -(a+17 d) = 5- 77
-8d = -72
d= 72/8
d= 9
put the value of d in eq (1)
a+9(9)=5
a+81=5
a=5-81
a = -76
the following A.ps are
-76,-67 ,-58
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