26. Which term of the A.P. 3, 10, 17, ... will be 84 more than its 13th term?
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26. Which term of the A.P. 3, 10, 17, ... will be 84 more than its 13th term?
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Answer:
25th term
Step-by-step explanation:
a = 3
d = 7 ,
13th term will be ,
xa13 = a + 12d
a13 = 3 + 12×7
a13 = 3+ 84 = 87
Since , 84 more than its 13th term ,so ,
value of term will be = 87 + 84 = 171
So value of term is 171
Now using ,
an = a+(n-1)d
171 = 3 + 7n - 7
171 + 4 = 7n
175/7 = n
n = 25 ,
So 25th term will be 84 more than its 13th term ,
Verification :-
a25 = a + 24 d
a25 = 3 + 24×7
a25 = 3 + 168 = 171
Hope it helps
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Answer:
whaa
whaa
aaahahaStep-by-step explanation: