Question

Find the following sum?
a.1+2+3+4+5+_____+20
b.5+10+15+25+25_____+100
c.7+12+17+22+27+_____+102​

Answer 1

Answer:

a.10

b.50

c.32

this the correct answer

Answer 2

Answer:

2+5 or 2*5+2=12

3+6 or 3*6+3=21

So final answer 5+8 or 5*8+5=45

Approach 2:-

1+4 = 5 ;

2+5 = 2 +5 + (5) =12

3 +6 = 3 + 6+ (12) = 21

5 + 8 = 5+8 +(21) = 34

here number in brackets is previous value.

Approach 3:-

if you will difference of final values, it will be AP means

5, 12, 21, ?

Here gap of this series is 7, 9, 11,

hence next term = 21 + 11 = 32

Approach 4:

If you will Consider missing values which in bold,

1+4 = 5

2 +5 = 12

3 + 6 = 21

4 + 7 = 32

5 + 8 = ?

Here gap of this series is 7, 9, 11, 13,

hence next term = 32 + 13 = 45

Step-by-step explanation:

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