how many terms of the A.P 16,14,12..... are neex to given the sum 60
Answers
Answered by
1
Step-by-step explanation:
16+14+12=42
60- 42
= 18
so your answer is 18
Answered by
2
Answer:
Sn = n/2 {2a+(n-1)×d}
where sn is sum of A.P.
a is first term =16
d is common difference =14-16=-2
n is no. of terms which we have to find
60= n/2{2×16+(n-1)×-2}
60×2= n(32+2n-2)
60= n(15+n)
n²+15n -60=0
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