What value will come in place of question mark (?) in the number - series given below ?
4, 30, ?, 1440, 7195, 71940
4 30 ? 1440 7195 71940
Here the given series follows a pattern of
4
4 x 10 - 10 = 30
30 x 5 - 5 = 145
145 x 10 - 10 = 1440
1440 x 5 - 5 = 7195
7195 x 10 - 10 = 71940
Hence, the missing number is 145
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What is the next number of the following sequence ?
21, 77, 165, 285, ......
The series follow the rule,
21 = 77 = 92-4165 = 132-4285 = 172-4
5,9,13,17,21,(+4)...In the same way next no. will be 212-4 = 441 - 4 = 437
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Consider the following chemical reaction :
aFe2O3(s) + bCO(g) + cFe(s) + dCO2
In the balanced chemical equation of the above, which of the following will be the values of the coefficients a, b, c and d respectively?
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In this reaction, the iron oxide is reduced to iron, and the carbon is oxidised to carbon dioxide.
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