74
32
42
170
Correct answer is D
Tn=22n−1
T1=22(1)−1
= 2
T2=22(2)−1
= 8
T3=22(3)−1
= 32
T4=22(4)−1
= 128
T1+T2+T3+T4=2+8+32+128
= 170
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