Calculate mentally and match the pairs.

1450 + 650

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1890 + 310

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999 + 1001

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2100

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2200

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2000

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Q. Match the pairs from 'A' and 'B' columns and explain the effect of pollution on human health.

Column 'A'	Column 'B'
1. Water containing cobalt	a. Mental retardedness
2. Methane gas	b. Paralysis
3. Water containing lead	c. Inflammation of lungs.
4. Sulphur dioxide	d. Skin cancer
5. Nitrogen dixoide	e. Irritation of eyes

What are the possible outcomes when three unbiased coins are tossed simultaneously? Please explain it in detail how to calculate it mentally when some other number is used as in this case,3.

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