which of the term of the AP : 121,117,113.....,is its first negative term? Please do fast
Answers & Comments
lavleenghotra
A= 121 D=117-121= - 4 An<0 a+(n-1)d<0 121+(n-1)-4 <0 121-4n+4<0 125-4n<0 125<4n n<125/4 n<31.2 As n is not a perfect number, it is 31.2 Then the nearest value of n is 32. Justification - A32=121+31*-4 A32=121-124 A 32=-4 Hence verified
Answers & Comments
D=117-121= - 4
An<0
a+(n-1)d<0
121+(n-1)-4 <0
121-4n+4<0
125-4n<0
125<4n
n<125/4
n<31.2
As n is not a perfect number, it is 31.2
Then the nearest value of n is 32.
Justification -
A32=121+31*-4
A32=121-124
A 32=-4
Hence verified