1
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
Change Language
If $$\left( {\overrightarrow a + 3\overrightarrow b } \right)$$ is perpendicular to $$\left( {7\overrightarrow a - 5\overrightarrow b } \right)$$ and $$\left( {\overrightarrow a - 4\overrightarrow b } \right)$$ is perpendicular to $$\left( {7\overrightarrow a - 2\overrightarrow b } \right)$$, then the angle between $$\overrightarrow a $$ and $$\overrightarrow b $$ (in degrees) is _______________.
Your input ____
2
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
Change Language
If a + b + c = 1, ab + bc + ca = 2 and abc = 3, then the value of a4 + b4 + c4 is equal to ______________.
Your input ____
3
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
Change Language
A fair coin is tossed n-times such that the probability of getting at least one head is at least 0.9. Then the minimum value of n is ______________.
Your input ____
4
JEE Main 2021 (Online) 25th July Evening Shift
Numerical
+4
-1
Change Language
If the co-efficient of x7 and x8 in the expansion of $${\left( {2 + {x \over 3}} \right)^n}$$ are equal, then the value of n is equal to _____________.
Your input ____
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