2. Correct order of third Ionisation energy of B,C,N,O will be:- 1) O>N>C>B 2) O>C>N>B 3) N>O>C>B

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n .

5^{10} \div 5^{8} = {(\frac{1}{5})}^{n}

{(\frac{- 2}{3})}^{4} \div {(\frac{- 2}{3})}^{3} = {(\frac{- 3}{2})}^{n}

{(- 5)}^{4} \div {(- 5)}^{2} = 5^{n}

On simplification, the expression $\frac{5^{n + 2} - 6 \times 5^{n + 1}}{13 \times 5^{n} - 2 \times 5^{n + 1}}$ equals

(a) $\frac{5}{3}$ (b) $- \frac{5}{3}$ (c) $\frac{3}{5}$ (d) $- \frac{3}{5}$

Find the value of $^{n} C_{0}$ 4 + $4^{2}$ × $\frac{^{n} C_{1}}{2}$ + ......... $\frac{4^{n + 1}}{n + 1}$ × $^{n} C_{n}$

n

2 n + 8 : 5 n - 3,

n^{th}

The set builder form of " A is the set of the whole numbers which are divisible by 5 and are less than 7" is

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