Question
If √f + (1/√f) = 5, then find the value of f +
(1/f).Solution
Given, √f + (1/√f) = 5
On squaring both sides:
(√f + (1/√f)) 2 = 52
Expanding:
f + 2 + (1/f) = 25
Simplifying:
f + (1/f) + 2 = 25
Subtracting 2 from both sides:
f + (1/f) = 23
16, 32, 68, 132, ?, 376
What will come in place of the question mark (?) in the following series?
60, 94, 184, 464, 1388, ?
Complete the series choosing the missing number.
110, 99, 86, ___, 54, 35.
380, ?, 360, 324, 260, 160
8      27       64      125     ?       343Â
...137, 130, ?, 95, 67, 32
2, 13, 27, 44, ?, 87
What will come in place of the question mark (?) in the following series?
20, ?, 30, 60, 150, 450
5   3   4   7.5   17    ?    138
1290, 1225, 1175, ?, 1112, 1095, 1085
