1)In an A.P. d=-4, a=6 and nth term is -46, then n=......
a)14
b)12
c)13
d)15
Answers
Answered by
0
Answer a) 14
Step-by-step explanation:
-46 = a +(n-1)d
-46=6 +(n-1)-4
-52=-4n+4
-56/-4=n
14 = n
Answered by
0
Answer:
Step-by-step explanation:
a = 6
d = -4
an= -46
an = n/2 (2a +(n-1)d)
-46 = n/2 (2(6)+(n-1)(-4))
-46 = n/2 (12+4n+4)
(-46)(2) = n (16+4n)
-92 = 16n + 4n²
4n²+16n+92 = 0
solve this equation and get n
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