Question

If = $\frac { 17 } { 16 }$, then n is equal to

• A. 7
• B. 12
• C. 8
• D. None of these

Answer 1

Answer: (A)

7

Answer 2

Ž $\frac { \frac { \mathrm { n } } { 2 } [ 2 \times 5 + ( \mathrm { n } - 1 ) 4 ] } { \frac { \mathrm { n } + 1 } { 2 } [ 2 \times 7 + ( \mathrm { n } + 1 - 1 ) 2 ] }$ = $\frac { 17 } { 16 }$

Ž = $\frac { 17 } { 16 }$Ž = $\frac { 17 } { 16 }$

Ž $\frac { 2 n ^ { 2 } + 3 n } { n ^ { 2 } + 8 n + 7 }$= $\frac { 17 } { 16 }$Ž 32n² + 48n = 17n² + 136n + 119

Ž 15n² – 88n –119 = 0

Ž (n –7) (15n + 17) = 0 Ž n = 7