6. If P = 3, R = 27, T = 243, then Q + S = ______

- Option : A
- Explanation :

P = 3^{1}

Q = 3^{2}= 9

R = 3^{3}= 27

S = 3^{4}= 81

T = 3^{5}= 243

So, Q + S = 9 + 81 = 90

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- Option : D
- Explanation :

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- Option : B
- Explanation :

Billions of people are affected by melting glaciers.

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- Option : B
- Explanation :

Radius of inner circle = a

Radius of outer circle = b

Radius of small circle = (b - a)/2

area of donut shaped figure = π(b^{2}– a^{2})

Area of each small circle =

total area of all small circle= n

Area of remaining portion

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