Find the missing number:
12, 21, 23, 32, 34, 43, 45, ?

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Solution

The correct option is A 54
Option A is the correct answer
Explanation
It is addition series in which 9 and 2 are added alternatively
$12 + 9 = 21$
$21 + 2 = 23$
$23 + 9 = 32$
$32 + 2 = 34$
$34 + 9 = 43$
$43 + 2 = 45$
$45 + 9 = 54$
Hence 54is correct answer

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Simplifyand express each of the following in exponential form:

(i) $\frac{2^{3} \times 3^{4} \times 4}{3 \times 32}$

(ii) $({5^{2}}^{3} \times 5^{4}) \div 5^{7}$

(iii) $25^{4} \div 5^{3}$

(iv) $\frac{3 \times 7^{2} \times 11^{8}}{21 \times 11^{3}}$

(v) $\frac{3^{7}}{3^{4} \times 3^{3}}$

(vi) $2^{0} + 3^{0} + 4^{0}$

(vii) $2^{0} \times 3^{0} \times 4^{0}$

(viii) $(3^{0} + 2^{0}) \times 5^{0}$

(ix) $\frac{2^{8} \times a^{5}}{4^{3} \times a^{3}}$

(x) $\frac{a^{5}}{a^{3}} \times a^{8}$

(xi) $\frac{4^{5} \times a^{8} b^{3}}{4^{5} \times a^{5} b^{2}}$

(xii) $(2^{3} \times 2)^{2}$

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