Question

If $\frac { 3 + 5 + 7 + \ldots \ldots . + \mathrm { n } \text { terms } } { 5 + 8 + 11 + \ldots \ldots + 10 \text { terms } }$ = 7 then value of n is –

• A. 35
• B. 36
• C. 37
• D. 40

Answer 1

Answer: (A)

35

Answer 2

$\frac { \frac { \mathrm { n } } { 2 } ( 6 + ( \mathrm { n } - 1 ) 2 ) } { \frac { 10 } { 2 } ( 10 + 9 \times 3 ) }$ = 7 ̃ = 7

̃ $\frac { \mathrm { n } ( \mathrm { n } + 2 ) } { 5 ( 37 ) }$ = 7 ̃ n = 35