Question

1. draw a flowchart to display the odd numbers that are also divisible by 7 between 1 to 50.​

Answer 1

Answer:

first odd no divisible by 7 between 50 and 250

is 7*9=63

Next such no =7*11=77

Now 250=35*7+5

thus such last no=35*7=245

thus sum=7*(9+11+13+15+…………………..+35)……..(1)

This is an AP with a=9 and d=2

Let 35 is nth term in this AP

then 35=9+(n-1)*2

n-1=26/2=13

n=14

Thus sum of series(1)

S=7*14/2(18+13*2)

=49*44

S=2156

Explanation:

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Answer 2

Answer:

first odd no divisible by 7 between 50 and 250

is 7*9=63

Next such no =7*11=77

Now 250=35*7+5

thus such last no=35*7=245

thus sum=7*(9+11+13+15+…………………..+35)……..(1)

This is an AP with a=9 and d=2

Let 35 is nth term in this AP

then 35=9+(n-1)*2

n-1=26/2=13

n=14

Thus sum of series(1)

S=7*14/2(18+13*2)

=49*44

S=2156

Explanation:

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