Question

Find the missing number in the following series 3420, 1660,780, 340,?, 10
Select one:
a. 185
b. 120
c. 135
d. 75

Answer 1

Answer:

the missing number is=120

Step-by-step explanation:

According to series taking first number then divide it by 2 and subtract 50 from it we get the next number.

As \frac{3420}{2}-50=1710-50=1660

2

3420

−50=1710−50=1660

Now, Follow this pattern for next terms

\frac{1660}{2}-50=830-50=780

2

1660

−50=830−50=780

\frac{780}{2}-50=390-50=340

2

780

−50=390−50=340

Similarly,

\frac{340}{2}-50=170-50=120

2

340

−50=170−50=120

For confirmation,

\frac{120}{2}-50=60-50=10

2

120

−50=60−50=10

Therefore, The required missing number is 120.

Answer 2

Answer:

.

Answer is 120

Step-by-step explanation:

.

340 × 2 = 680 + 100 = 780

.

780 × 2 = 1560 + 100 = 1660

.

1660 × 2 = 3320 + 100 = 3420

.

.

Therefore 120 × 2 = 240 + 100 = 340

.

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