The graph of the quadratic polynomial -x2 + x + 90 will open upwards.
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In a room there are eight couples. Out of them if 4 people are selected at random, the probability that they may be couples is
A bag contains 7 red and 4 blue balls. Two balls are drawn at random with replacement. The probability of getting the balls of different colors is:
Answer the following question on the basis of above table The average temperature in the region is
When the researcher does not know the identity of the experimental and placebo groups, the study is termed as