If 2a=√64,thena4 is equal to
8
4
2
16
1
2a=√(82)⇒2a=8⇒a=4∴a4=1
Question 19
40% of [100 - 20% of 300] is equal to (a) 20 (b) 16 (c) 140 (d) 64
The value of 10∑r=0 cos3 πr3 is equal to