If`(2n+5)=3(3n-10)`,then n=?

If 2(2n+5)=3(3n-10), then n=5 (b) 37(d)8

If 2(2n+5)=3\ (3n-10), then n= (a)5 (b) 3 (c)7 (d) 8

If ratio of the work done by n men in (n+2) days is to the work done by n+3 men in n days is (n^(2)+2n+9):(n^(2)+3n+10), then n is equal to

If ratio of the work done by n men in (n+2) days is to the work done by n+3 men in n days is (n^(2)+2n+9):(n^(2)+3n+10), then n is equal to

If ""^(n ) C _(3) : ""^(n) C_(2) = 10 : 3 , then n=

If n/2 - (3n)/4 + (5n)/6 = 21 , then n = ?

If S_(n) = 5n^(2) + 3n, then 2^(nd) term is …………… .

State whether each of the following statements is true or false : For an AP, if S_n= 5n^(2) - 3n , then a_(n) = 10n - 8

Prove by the principle of mathematical induction that 2+5+8+11+….+(3n-1)=1/2n(3n+1),AA n in N .