If 2- 1-81-3- 2-278-2- 5-8125- then 1- 3 - -

The correct option is A 127The rule is : #160; a× b= a ^ 3 b ^ 3 2× 1= 2 ^ 3 1 ^ 3 =81 etc So, 1× 3= 1 ^ 3 3 ^ 3 =127 ...

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Standard VII

Mathematics

Area of a Triangle

If 2× 1=81;...

Question

If $2 \times 1 = 81; 3 \times 2 = 278; 2 \times 5 = 8125$ , then $1 \times 3$ = ?

127

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271

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126

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129

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132

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Solution

The correct option is A 127
The rule is : $a \times b = a^{3} b^{3}$
$2 \times 1 = 2^{3} 1^{3} = 81 e t c$
So, $1 \times 3 = 1^{3} 3^{3} = 127$

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Similar questions

Q. If 2

\times

1 = 81; 3

\times

2 = 278; 2

\times

5 = 8125 then 1

\times

, then 5 = ‘?’.

यदि 1 =

P = 1 + \frac{1}{2 \times 2} + \frac{1}{3 \times 2^{2}} + . . . . . . . . . .

Q = \frac{1}{1 \times 2} + \frac{1}{3 \times 4} + \frac{1}{5 \times 6} + . . . . . . . . . .

then,

Q. If

α = 2 t a n^{- 1} (2 \sqrt{2} - 1)

and

β = 3 s i n^{- 1} (1 / 3) + s i n^{- 1} (3 / 5)

then

Q. If

P = 1 + \frac{1}{2 \times 2} + \frac{1}{3 \times 2^{2}} + . . .

and

Q = \frac{1}{1 \times 2} + \frac{1}{3 \times 4} + \frac{1}{5 \times 6} + . . . . .

, then

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If 2×1=81;3×2=278;2×5=8125, then 1×3 = ?

The correct option is A 127The rule is : a×b=a3b32×1=2313=81etcSo, 1×3=1333=127

If $2 \times 1 = 81; 3 \times 2 = 278; 2 \times 5 = 8125$ , then $1 \times 3$ = ?

The correct option is A 127
The rule is : $a \times b = a^{3} b^{3}$
$2 \times 1 = 2^{3} 1^{3} = 81 e t c$
So, $1 \times 3 = 1^{3} 3^{3} = 127$